> ## Documentation Index
> Fetch the complete documentation index at: https://www.dropfans.io/developers/llms.txt
> Use this file to discover all available pages before exploring further.

# PUT /api/external/v1/media/uploads/{id}/parts/{partNumber} — Upload one part (image / audio)

> Uploads one part of an image or audio session: the raw bytes as the request body (`Content-Type: application/octet-stream`).

- Source: https://www.dropfans.io/developers/reference/upload-media-part
- Section: API reference
- OpenAPI: https://www.dropfans.io/developers/openapi.json

Also served at `/api/external/media/uploads/{id}/parts/{partNumber}` (the unversioned alias).

Uploads one part of an image or audio session: the raw bytes as the request body (`Content-Type: application/octet-stream`).

Every part except the last is exactly `partSize` (3 MB); the last one is the remainder. Send parts in any order and in parallel. Repeating a part replaces it, so retry a failed part freely.

## Authentication

`Authorization: Bearer dpfn_...` — an API key generated in the dashboard (Vault → API Connect). By default the key acts for the one account it belongs to. Missing or invalid keys return 401 `{"error":"Unauthorized","code":"unauthorized"}`.

**For a creator you manage or onboarded:** `PUT /api/external/v1/creators/{creatorId}/media/uploads/{id}/parts/{partNumber}` — with a verified agency's own key for a creator or AI persona it manages, or your app owner's own key for an account your app onboarded (ids from GET /api/external/v1/creators); for a managed creator the agency needs `canManageVault`. The response echoes the account acted on in `X-Dropfans-Account`. Sending `X-Dropfans-Account: <account id>` on the plain path still works but is deprecated.

## Path parameters

| Field | Type | Required | Description |
|---|---|---|---|
| `id` | string | yes | The upload `id` from POST /api/external/v1/media/uploads. |
| `partNumber` | integer | yes | 1-based part number, up to `totalParts`. |

## Responses

### 200

Part stored.

| Field | Type | Required | Description |
|---|---|---|---|
| `id` | string | yes | Upload id. |
| `partNumber` | integer | yes | The part you sent. |
| `sizeBytes` | integer | yes | Bytes received. |
| `receivedParts` | integer[] | yes | Parts received so far. |
| `missingParts` | integer[] | yes | Parts still missing — empty means you can complete. |

```json
{
  "id": "mu_3f9c1a7be0d24c55a1e8b6f2",
  "partNumber": 1,
  "sizeBytes": 3145728,
  "receivedParts": [
    1
  ],
  "missingParts": [
    2,
    3
  ]
}
```

## Errors

| Status | Body | When |
|---|---|---|
| 400 | `{"error":"Part number must be 1–3","code":"invalid_part_number"}` | Part number out of range. |
| 400 | `{"error":"Part 3 must be exactly 1612811 bytes (got 1000)","code":"part_size_mismatch","expectedBytes":1612811}` | The part is not exactly the size it must have. |
| 400 | `{"error":"Video sessions upload with tus — send the bytes to the tus endpoint","code":"parts_not_used"}` | A video session. |
| 401 | `{"error":"Unauthorized","code":"unauthorized"}` | Missing or invalid API key. |
| 404 | `{"error":"Upload not found","code":"upload_not_found"}` | Unknown id, or an upload of another account. |
| 409 | `{"error":"This upload is completed and takes no more parts","code":"upload_not_accepting_parts","status":"completed"}` | The session is completed, failed or being completed. |
| 410 | `{"error":"This upload session has expired — start a new one","code":"upload_expired"}` | Past `expiresAt`. |
| 413 | `{"error":"Parts are at most 3145728 bytes","code":"part_too_large","partSize":3145728}` | The part is bigger than `partSize`. |
| 400 | `{"error":"X-Dropfans-Account must be an account id (from GET /api/external/agency/creators), not a username.","code":"invalid_account_header"}` | `X-Dropfans-Account` is not an account id. |
| 400 | `{"error":"X-Dropfans-Account names a different account than the path — send one or the other.","code":"account_mismatch"}` | Called under /v1/creators/{creatorId}/ with an `X-Dropfans-Account` naming another account. |
| 403 | `{"error":"This key cannot act for that account.","code":"account_not_managed"}` | The creator in the path (or `X-Dropfans-Account`) is one this key cannot act for: no ACCEPTED management by your agency and not an account your app onboarded (or it no longer holds a key bound to your app), a key minted for one creator, or someone is suspended, banned or deleted. An unknown id gets the same answer. |
| 403 | `{"error":"The agency does not have permission for this on that account.","code":"permission_denied","permission":"canManageVault"}` | For a managed creator: the agency lacks `canManageVault` on that account. |
| 403 | `{"error":"This app does not have the vault API category enabled. Contact support to enable it.","code":"api_category_disabled","category":"vault"}` | Your app has the Vault [API category](https://www.dropfans.io/developers/concepts/api-categories.md) switched off. |

## Rate limiting

Per-key fixed windows by tier (Personal 60/min · 5,000/day; approved apps 300/min · 50,000/day; Dropfans-operated integrations exempt). Read the live values from X-RateLimit-Tier, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset and their -Day variants; a 429 carries Retry-After and `{"error":"Rate limit exceeded","code":"rate_limited"}`. See [Rate limits](https://www.dropfans.io/developers/concepts/rate-limits.md).

## Code samples

### curl

```bash
curl -X PUT "https://www.dropfans.io/api/external/v1/media/uploads/$VAULT_ITEM_ID/parts/$VAULT_ITEM_ID" \
  -H "Authorization: Bearer $DROPFANS_API_KEY"
```

### Node

```javascript
const vaultItemId = '…'; // from an earlier response
const vaultItemId = '…'; // from an earlier response

const res = await fetch(`https://www.dropfans.io/api/external/v1/media/uploads/${vaultItemId}/parts/${vaultItemId}`, {
  method: 'PUT',
  headers: {
    Authorization: `Bearer ${process.env.DROPFANS_API_KEY}`,
  },
});
console.log(await res.json());
```

### Python

```python
import os
import requests

vault_item_id = "…"  # from an earlier response
vault_item_id = "…"  # from an earlier response

res = requests.put(
    f"https://www.dropfans.io/api/external/v1/media/uploads/{vault_item_id}/parts/{vault_item_id}",
    headers={"Authorization": f"Bearer {os.environ['DROPFANS_API_KEY']}"},
)
print(res.json())
```

## OpenAPI

```json
{
  "method": "PUT",
  "path": "/api/external/v1/media/uploads/{id}/parts/{partNumber}",
  "operationId": "uploadMediaPart",
  "tags": [
    "vault"
  ],
  "summary": "Upload one part (image / audio)",
  "description": "Uploads one part of an image or audio session: the raw bytes as the request body (`Content-Type: application/octet-stream`).\n\nEvery part except the last is exactly `partSize` (3 MB); the last one is the remainder. Send parts in any order and in parallel. Repeating a part replaces it, so retry a failed part freely.",
  "parameters": [
    {
      "name": "id",
      "in": "path",
      "required": true,
      "description": "The upload `id` from POST /api/external/v1/media/uploads.",
      "schema": {
        "type": "string"
      },
      "example": "mu_3f9c1a7be0d24c55a1e8b6f2"
    },
    {
      "name": "partNumber",
      "in": "path",
      "required": true,
      "description": "1-based part number, up to `totalParts`.",
      "schema": {
        "type": "integer",
        "minimum": 1
      },
      "example": 1
    },
    {
      "name": "X-Dropfans-Account",
      "in": "header",
      "required": false,
      "deprecated": true,
      "description": "Deprecated: call the …ForCreator operation (/api/external/v1/creators/{creatorId}/…) instead; the header keeps working and such responses carry Deprecation and Link: rel=\"successor-version\". With a verified agency’s own key, the id of a creator or AI persona the agency manages (from GET /api/external/v1/agency/creators): the request then acts as that account, exactly as if it were sent with that account’s own key. Account ids only — usernames are refused (400 invalid_account_header). Checked on every request: the management must be ACCEPTED, nobody may be suspended, banned or deleted (else 403 account_not_managed), and the agency needs the endpoint’s permission on that account (else 403 permission_denied). Omit it to act as the key’s own account.",
      "schema": {
        "type": "string",
        "pattern": "^c[a-z0-9]{20,32}$"
      },
      "example": "cmh4v2q8k0003xy9z7w6v5u4t"
    }
  ],
  "responses": {
    "200": {
      "description": "Part stored.",
      "headers": {
        "X-RateLimit-Tier": {
          "description": "Rate-limit tier of the key: personal, app or first_party (first_party is unlimited).",
          "schema": {
            "type": "string",
            "enum": [
              "personal",
              "app",
              "first_party"
            ]
          }
        },
        "X-RateLimit-Limit": {
          "description": "Requests allowed per minute for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining": {
          "description": "Requests left in the current minute window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset": {
          "description": "Epoch seconds when the minute window resets.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Limit-Day": {
          "description": "Requests allowed per UTC day for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining-Day": {
          "description": "Requests left in the current UTC day window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset-Day": {
          "description": "Epoch seconds when the day window resets.",
          "schema": {
            "type": "integer"
          }
        },
        "X-Dropfans-Account": {
          "description": "The id of the account this request acted on — the key’s own account, or the managed account named in the X-Dropfans-Account request header. Assert it when acting for several accounts.",
          "schema": {
            "type": "string"
          }
        }
      },
      "content": {
        "application/json": {
          "schema": {
            "type": "object",
            "properties": {
              "id": {
                "type": "string",
                "description": "Upload id."
              },
              "partNumber": {
                "type": "integer",
                "description": "The part you sent."
              },
              "sizeBytes": {
                "type": "integer",
                "description": "Bytes received."
              },
              "receivedParts": {
                "type": "array",
                "items": {
                  "type": "integer",
                  "description": "Part number."
                },
                "description": "Parts received so far."
              },
              "missingParts": {
                "type": "array",
                "items": {
                  "type": "integer",
                  "description": "Part number."
                },
                "description": "Parts still missing — empty means you can complete."
              }
            },
            "required": [
              "id",
              "partNumber",
              "sizeBytes",
              "receivedParts",
              "missingParts"
            ]
          },
          "example": {
            "id": "mu_3f9c1a7be0d24c55a1e8b6f2",
            "partNumber": 1,
            "sizeBytes": 3145728,
            "receivedParts": [
              1
            ],
            "missingParts": [
              2,
              3
            ]
          }
        }
      }
    },
    "400": {
      "description": "Part number out of range. Also: The part is not exactly the size it must have. Also: A video session. Also: `X-Dropfans-Account` is not an account id. Also: Called under /v1/creators/{creatorId}/ with an `X-Dropfans-Account` naming another account.",
      "headers": {
        "X-RateLimit-Tier": {
          "description": "Rate-limit tier of the key: personal, app or first_party (first_party is unlimited).",
          "schema": {
            "type": "string",
            "enum": [
              "personal",
              "app",
              "first_party"
            ]
          }
        },
        "X-RateLimit-Limit": {
          "description": "Requests allowed per minute for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining": {
          "description": "Requests left in the current minute window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset": {
          "description": "Epoch seconds when the minute window resets.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Limit-Day": {
          "description": "Requests allowed per UTC day for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining-Day": {
          "description": "Requests left in the current UTC day window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset-Day": {
          "description": "Epoch seconds when the day window resets.",
          "schema": {
            "type": "integer"
          }
        }
      },
      "content": {
        "application/json": {
          "schema": {
            "type": "object",
            "properties": {
              "error": {
                "type": "string",
                "description": "Human-readable message.",
                "example": "Rate limit exceeded"
              },
              "code": {
                "type": "string",
                "description": "Machine-readable code: unauthorized, app_suspended, first_party_only, api_category_disabled, rate_limited, username_required, invalid_account_header, account_not_managed, permission_denied, account_header_not_allowed, agency_key_required — plus endpoint-specific codes listed on each reference page.",
                "example": "rate_limited"
              }
            },
            "required": [
              "error",
              "code"
            ]
          },
          "example": {
            "error": "Part number must be 1–3",
            "code": "invalid_part_number"
          }
        }
      }
    },
    "401": {
      "description": "Missing or invalid API key.",
      "headers": {
        "X-RateLimit-Tier": {
          "description": "Rate-limit tier of the key: personal, app or first_party (first_party is unlimited).",
          "schema": {
            "type": "string",
            "enum": [
              "personal",
              "app",
              "first_party"
            ]
          }
        },
        "X-RateLimit-Limit": {
          "description": "Requests allowed per minute for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining": {
          "description": "Requests left in the current minute window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset": {
          "description": "Epoch seconds when the minute window resets.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Limit-Day": {
          "description": "Requests allowed per UTC day for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining-Day": {
          "description": "Requests left in the current UTC day window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset-Day": {
          "description": "Epoch seconds when the day window resets.",
          "schema": {
            "type": "integer"
          }
        }
      },
      "content": {
        "application/json": {
          "schema": {
            "type": "object",
            "properties": {
              "error": {
                "type": "string",
                "description": "Human-readable message.",
                "example": "Rate limit exceeded"
              },
              "code": {
                "type": "string",
                "description": "Machine-readable code: unauthorized, app_suspended, first_party_only, api_category_disabled, rate_limited, username_required, invalid_account_header, account_not_managed, permission_denied, account_header_not_allowed, agency_key_required — plus endpoint-specific codes listed on each reference page.",
                "example": "rate_limited"
              }
            },
            "required": [
              "error",
              "code"
            ]
          },
          "example": {
            "error": "Unauthorized",
            "code": "unauthorized"
          }
        }
      }
    },
    "403": {
      "description": "The creator in the path (or `X-Dropfans-Account`) is one this key cannot act for: no ACCEPTED management by your agency and not an account your app onboarded (or it no longer holds a key bound to your app), a key minted for one creator, or someone is suspended, banned or deleted. An unknown id gets the same answer. Also: For a managed creator: the agency lacks `canManageVault` on that account. Also: Your app has the Vault [API category](https://www.dropfans.io/developers/concepts/api-categories.md) switched off.",
      "headers": {
        "X-RateLimit-Tier": {
          "description": "Rate-limit tier of the key: personal, app or first_party (first_party is unlimited).",
          "schema": {
            "type": "string",
            "enum": [
              "personal",
              "app",
              "first_party"
            ]
          }
        },
        "X-RateLimit-Limit": {
          "description": "Requests allowed per minute for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining": {
          "description": "Requests left in the current minute window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset": {
          "description": "Epoch seconds when the minute window resets.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Limit-Day": {
          "description": "Requests allowed per UTC day for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining-Day": {
          "description": "Requests left in the current UTC day window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset-Day": {
          "description": "Epoch seconds when the day window resets.",
          "schema": {
            "type": "integer"
          }
        }
      },
      "content": {
        "application/json": {
          "schema": {
            "type": "object",
            "properties": {
              "error": {
                "type": "string",
                "description": "Human-readable message.",
                "example": "Rate limit exceeded"
              },
              "code": {
                "type": "string",
                "description": "Machine-readable code: unauthorized, app_suspended, first_party_only, api_category_disabled, rate_limited, username_required, invalid_account_header, account_not_managed, permission_denied, account_header_not_allowed, agency_key_required — plus endpoint-specific codes listed on each reference page.",
                "example": "rate_limited"
              }
            },
            "required": [
              "error",
              "code"
            ]
          },
          "example": {
            "error": "This key cannot act for that account.",
            "code": "account_not_managed"
          }
        }
      }
    },
    "404": {
      "description": "Unknown id, or an upload of another account.",
      "headers": {
        "X-RateLimit-Tier": {
          "description": "Rate-limit tier of the key: personal, app or first_party (first_party is unlimited).",
          "schema": {
            "type": "string",
            "enum": [
              "personal",
              "app",
              "first_party"
            ]
          }
        },
        "X-RateLimit-Limit": {
          "description": "Requests allowed per minute for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining": {
          "description": "Requests left in the current minute window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset": {
          "description": "Epoch seconds when the minute window resets.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Limit-Day": {
          "description": "Requests allowed per UTC day for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining-Day": {
          "description": "Requests left in the current UTC day window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset-Day": {
          "description": "Epoch seconds when the day window resets.",
          "schema": {
            "type": "integer"
          }
        }
      },
      "content": {
        "application/json": {
          "schema": {
            "type": "object",
            "properties": {
              "error": {
                "type": "string",
                "description": "Human-readable message.",
                "example": "Rate limit exceeded"
              },
              "code": {
                "type": "string",
                "description": "Machine-readable code: unauthorized, app_suspended, first_party_only, api_category_disabled, rate_limited, username_required, invalid_account_header, account_not_managed, permission_denied, account_header_not_allowed, agency_key_required — plus endpoint-specific codes listed on each reference page.",
                "example": "rate_limited"
              }
            },
            "required": [
              "error",
              "code"
            ]
          },
          "example": {
            "error": "Upload not found",
            "code": "upload_not_found"
          }
        }
      }
    },
    "409": {
      "description": "The session is completed, failed or being completed.",
      "headers": {
        "X-RateLimit-Tier": {
          "description": "Rate-limit tier of the key: personal, app or first_party (first_party is unlimited).",
          "schema": {
            "type": "string",
            "enum": [
              "personal",
              "app",
              "first_party"
            ]
          }
        },
        "X-RateLimit-Limit": {
          "description": "Requests allowed per minute for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining": {
          "description": "Requests left in the current minute window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset": {
          "description": "Epoch seconds when the minute window resets.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Limit-Day": {
          "description": "Requests allowed per UTC day for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining-Day": {
          "description": "Requests left in the current UTC day window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset-Day": {
          "description": "Epoch seconds when the day window resets.",
          "schema": {
            "type": "integer"
          }
        }
      },
      "content": {
        "application/json": {
          "schema": {
            "type": "object",
            "properties": {
              "error": {
                "type": "string",
                "description": "Human-readable message.",
                "example": "Rate limit exceeded"
              },
              "code": {
                "type": "string",
                "description": "Machine-readable code: unauthorized, app_suspended, first_party_only, api_category_disabled, rate_limited, username_required, invalid_account_header, account_not_managed, permission_denied, account_header_not_allowed, agency_key_required — plus endpoint-specific codes listed on each reference page.",
                "example": "rate_limited"
              }
            },
            "required": [
              "error",
              "code"
            ]
          },
          "example": {
            "error": "This upload is completed and takes no more parts",
            "code": "upload_not_accepting_parts",
            "status": "completed"
          }
        }
      }
    },
    "410": {
      "description": "Past `expiresAt`.",
      "headers": {
        "X-RateLimit-Tier": {
          "description": "Rate-limit tier of the key: personal, app or first_party (first_party is unlimited).",
          "schema": {
            "type": "string",
            "enum": [
              "personal",
              "app",
              "first_party"
            ]
          }
        },
        "X-RateLimit-Limit": {
          "description": "Requests allowed per minute for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining": {
          "description": "Requests left in the current minute window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset": {
          "description": "Epoch seconds when the minute window resets.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Limit-Day": {
          "description": "Requests allowed per UTC day for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining-Day": {
          "description": "Requests left in the current UTC day window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset-Day": {
          "description": "Epoch seconds when the day window resets.",
          "schema": {
            "type": "integer"
          }
        }
      },
      "content": {
        "application/json": {
          "schema": {
            "type": "object",
            "properties": {
              "error": {
                "type": "string",
                "description": "Human-readable message.",
                "example": "Rate limit exceeded"
              },
              "code": {
                "type": "string",
                "description": "Machine-readable code: unauthorized, app_suspended, first_party_only, api_category_disabled, rate_limited, username_required, invalid_account_header, account_not_managed, permission_denied, account_header_not_allowed, agency_key_required — plus endpoint-specific codes listed on each reference page.",
                "example": "rate_limited"
              }
            },
            "required": [
              "error",
              "code"
            ]
          },
          "example": {
            "error": "This upload session has expired — start a new one",
            "code": "upload_expired"
          }
        }
      }
    },
    "413": {
      "description": "The part is bigger than `partSize`.",
      "headers": {
        "X-RateLimit-Tier": {
          "description": "Rate-limit tier of the key: personal, app or first_party (first_party is unlimited).",
          "schema": {
            "type": "string",
            "enum": [
              "personal",
              "app",
              "first_party"
            ]
          }
        },
        "X-RateLimit-Limit": {
          "description": "Requests allowed per minute for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining": {
          "description": "Requests left in the current minute window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset": {
          "description": "Epoch seconds when the minute window resets.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Limit-Day": {
          "description": "Requests allowed per UTC day for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining-Day": {
          "description": "Requests left in the current UTC day window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset-Day": {
          "description": "Epoch seconds when the day window resets.",
          "schema": {
            "type": "integer"
          }
        }
      },
      "content": {
        "application/json": {
          "schema": {
            "type": "object",
            "properties": {
              "error": {
                "type": "string",
                "description": "Human-readable message.",
                "example": "Rate limit exceeded"
              },
              "code": {
                "type": "string",
                "description": "Machine-readable code: unauthorized, app_suspended, first_party_only, api_category_disabled, rate_limited, username_required, invalid_account_header, account_not_managed, permission_denied, account_header_not_allowed, agency_key_required — plus endpoint-specific codes listed on each reference page.",
                "example": "rate_limited"
              }
            },
            "required": [
              "error",
              "code"
            ]
          },
          "example": {
            "error": "Parts are at most 3145728 bytes",
            "code": "part_too_large",
            "partSize": 3145728
          }
        }
      }
    },
    "429": {
      "description": "Rate limit exceeded for the current minute or day window. Wait Retry-After seconds and retry.",
      "headers": {
        "X-RateLimit-Tier": {
          "description": "Rate-limit tier of the key: personal, app or first_party (first_party is unlimited).",
          "schema": {
            "type": "string",
            "enum": [
              "personal",
              "app",
              "first_party"
            ]
          }
        },
        "X-RateLimit-Limit": {
          "description": "Requests allowed per minute for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining": {
          "description": "Requests left in the current minute window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset": {
          "description": "Epoch seconds when the minute window resets.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Limit-Day": {
          "description": "Requests allowed per UTC day for this key (absent on first_party).",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Remaining-Day": {
          "description": "Requests left in the current UTC day window.",
          "schema": {
            "type": "integer"
          }
        },
        "X-RateLimit-Reset-Day": {
          "description": "Epoch seconds when the day window resets.",
          "schema": {
            "type": "integer"
          }
        },
        "Retry-After": {
          "description": "Seconds to wait before retrying (sent with 429s).",
          "schema": {
            "type": "integer"
          }
        }
      },
      "content": {
        "application/json": {
          "schema": {
            "type": "object",
            "properties": {
              "error": {
                "type": "string",
                "description": "Human-readable message.",
                "example": "Rate limit exceeded"
              },
              "code": {
                "type": "string",
                "description": "Machine-readable code: unauthorized, app_suspended, first_party_only, api_category_disabled, rate_limited, username_required, invalid_account_header, account_not_managed, permission_denied, account_header_not_allowed, agency_key_required — plus endpoint-specific codes listed on each reference page.",
                "example": "rate_limited"
              }
            },
            "required": [
              "error",
              "code"
            ]
          },
          "example": {
            "error": "Rate limit exceeded",
            "code": "rate_limited"
          }
        }
      }
    }
  },
  "x-codeSamples": [
    {
      "lang": "cURL",
      "label": "curl",
      "source": "curl -X PUT \"https://www.dropfans.io/api/external/v1/media/uploads/$VAULT_ITEM_ID/parts/$VAULT_ITEM_ID\" \\\n  -H \"Authorization: Bearer $DROPFANS_API_KEY\""
    },
    {
      "lang": "JavaScript",
      "label": "Node",
      "source": "const vaultItemId = '…'; // from an earlier response\nconst vaultItemId = '…'; // from an earlier response\n\nconst res = await fetch(`https://www.dropfans.io/api/external/v1/media/uploads/${vaultItemId}/parts/${vaultItemId}`, {\n  method: 'PUT',\n  headers: {\n    Authorization: `Bearer ${process.env.DROPFANS_API_KEY}`,\n  },\n});\nconsole.log(await res.json());"
    },
    {
      "lang": "Python",
      "source": "import os\nimport requests\n\nvault_item_id = \"…\"  # from an earlier response\nvault_item_id = \"…\"  # from an earlier response\n\nres = requests.put(\n    f\"https://www.dropfans.io/api/external/v1/media/uploads/{vault_item_id}/parts/{vault_item_id}\",\n    headers={\"Authorization\": f\"Bearer {os.environ['DROPFANS_API_KEY']}\"},\n)\nprint(res.json())"
    }
  ],
  "x-dropfans-docs": "https://www.dropfans.io/developers/reference/upload-media-part",
  "x-dropfans-category": "vault",
  "x-dropfans-agency-permission": "canManageVault"
}
```

---

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