POST/organizations/{organizationId}/files/uploads

Create a multipart file upload

Creates an upload session and returns pre-signed part URLs for files up to 25 GB.

Send request

Use the documented inputs to call this endpoint directly.

API serverbase URL

Bearer tokenBearerAuthoptional

Stored only in this browser for the BearerAuth security scheme and reused on every API page in this group.

Parameters

Values are applied to the request and the example on the right.

organizationIdpath · stringrequired

Opaque organization identifier.

Idempotency-Keyheader · string · uuidoptional

Unique key for retry-safe writes, retained for 24 hours.

Request body

application/jsonrequired

filenamestringrequired

content_typestringrequired

size_bytesintegerrequired

checksum_sha256stringoptional

metadataobjectoptional

Responses

201application/json

Upload session created.

{
  "id": "upl_01J8FH2P6Q4T9V7M3K5",
  "file_id": "fil_01J8FE2X7M5P9Q4V6K1",
  "part_size_bytes": 8388608,
  "parts": [
    {
      "part_number": 1,
      "url": "https://uploads.demo.heyo.example/…",
      "expires_at": "2026-09-03T13:00:00Z"
    }
  ],
  "complete_url": "https://api.demo.heyo.example/v3/uploads/upl_01J8FH2P6Q4T9V7M3K5/complete",
  "expires_at": "2026-09-03T13:00:00Z"
}

idstringoptional

file_idstringoptional

part_size_bytesintegeroptional

partsarray<object>optional

complete_urlstringoptional

expires_atstring · date-timeoptional

413

Requested file is larger than the plan limit.

curl --request POST \ 'https://api.demo.heyo.example/v3/organizations/org_01J8F1Q6N6VTX4E8W9R2D0A7B3/files/uploads' \ --header 'Idempotency-Key: 5ba89923-8c6d-44a3-9ab7-2fbbdb865f9a' \ --header 'Content-Type: application/json' \ --data '{ "filename": "northstar-september-export.csv", "content_type": "text/csv", "size_bytes": 42829120, "checksum_sha256": "a7bc2a1e8fa70b02e5c3c28eaf7a315f9767a81700c31ee1d6987b16ef0295c2", "metadata": { "source": "analytics", "contains_pii": false }}'

{ "id": "upl_01J8FH2P6Q4T9V7M3K5", "file_id": "fil_01J8FE2X7M5P9Q4V6K1", "part_size_bytes": 8388608, "parts": [ { "part_number": 1, "url": "https://uploads.demo.heyo.example/…", "expires_at": "2026-09-03T13:00:00Z" } ], "complete_url": "https://api.demo.heyo.example/v3/uploads/upl_01J8FH2P6Q4T9V7M3K5/complete", "expires_at": "2026-09-03T13:00:00Z" }