Create a workspace asset upload

POST/api/v2/workspaces/{slug}/assets/

Start an upload. This is the first of three steps. Send the file's metadata, not the file. The API creates the asset with is_uploaded: false and returns a signed storage credential in upload_data. You then upload the file straight to storage and confirm the upload.

A successful call returns 200, not 201, and the body is an envelope rather than the bare asset:

• upload_data holds the storage url and the form fields to send with the file.
• asset_id is the new asset's id. Use it as {pk} when you confirm, read, or delete.
• asset_url is the asset's relative path, or null when the asset's entity_type has no asset route, as with the default WORK_ITEM_IMPORT.
• asset is the asset object.

Path Parameters

slug:requiredstring

The workspace slug. It appears in your Plane URLs. In https://app.plane.so/my-team/projects/, the slug is my-team.

Body Parameters

name:requiredstring

The file name.

size:requiredinteger

The file size in bytes. Must be at least 1.

entity_type:optionalstring

What the asset is for. Defaults to WORK_ITEM_IMPORT.

type:optionalstring

The file's MIME type, for example text/csv. Defaults to application/octet-stream. A type the endpoint doesn't accept is a 400.

Response shaping

fields:optionalstring

Comma-separated list of fields to return. Unrequested keys are omitted, not returned as null. id always comes back. Pass all for every requestable field. An unknown name is a 400. See Sparse fields.

Requestable here: asset_url, attributes, content_type, created_at, created_by_id, entity_type, external_id, external_source, id, is_uploaded, name, size, updated_at, updated_by_id.

Scopes

assets:write

Errors

Status	Code	Cause
400	invalid_request	The request body or a query parameter failed validation.
401	unauthorized	Missing or invalid credentials.
402	payment_required	The feature this endpoint belongs to isn't enabled on your plan or is switched off.
403	forbidden	Your role or token scope doesn't allow this.
404	not_found	No such resource, or it's outside your tenant.
406	not_acceptable	The Accept header asks for a representation the API can't produce.
409	conflict	A business rule blocks the write — see the notes above.
413	payload_too_large	The request body is over the size limit.
415	unsupported_media_type	The Content-Type isn't one this endpoint accepts.
429	rate_limited	Throttled. Honor the Retry-After header before retrying.

Create a workspace asset upload

curl -X POST \
  "https://api.plane.so/api/v2/workspaces/my-team/assets/" \
  -H "X-Api-Key: $PLANE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "name": "work-items.csv",
  "size": 18342,
  "entity_type": "WORK_ITEM_IMPORT",
  "type": "text/csv"
}'

import requests

response = requests.post(
    "https://api.plane.so/api/v2/workspaces/my-team/assets/",
    headers={"X-Api-Key": "your-api-key"},
    json={
        "name": "work-items.csv",
        "size": 18342,
        "entity_type": "WORK_ITEM_IMPORT",
        "type": "text/csv"
    },
)
print(response.json())

const response = await fetch("https://api.plane.so/api/v2/workspaces/my-team/assets/", {
  method: "POST",
  headers: {
    "X-Api-Key": "your-api-key",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    name: "work-items.csv",
    size: 18342,
    entity_type: "text/csv",
    type: "text/csv",
  }),
});
const data = await response.json();

Response200

{
  "upload_data": {
    "url": "https://plane-uploads.s3.amazonaws.com/",
    "fields": {
      "Content-Type": "text/csv",
      "key": "a3d1c5e7-2b4f-4a69-8c0d-7e5f1b3a9d24/0c7e2a9f4b1d4e6a8c3f5b7d9e1a2c46-work-items.csv",
      "x-amz-algorithm": "AWS4-HMAC-SHA256",
      "x-amz-credential": "AKIAIOSFODNN7EXAMPLE/20260114/us-east-1/s3/aws4_request",
      "x-amz-date": "20260114T092241Z",
      "policy": "eyJleHBpcmF0aW9uIjoiMjAyNi0wMS0xNFQxMDoyMjo0MVoifQ==",
      "x-amz-signature": "6f1a9c2e4b7d0835a1e9f2c6b4d8a0e3f5c7b9d1a2e4f6081c3b5d7e9f0a2c4b"
    }
  },
  "asset_id": "2d9e6b3f-4a1c-4e85-b7d0-9f3a1c6e8b52",
  "asset_url": null,
  "asset": {
    "id": "2d9e6b3f-4a1c-4e85-b7d0-9f3a1c6e8b52",
    "name": "work-items.csv",
    "content_type": "text/csv",
    "size": 18342.0,
    "attributes": {
      "name": "work-items.csv",
      "type": "text/csv",
      "size": 18342
    },
    "asset_url": null,
    "is_uploaded": false,
    "entity_type": "WORK_ITEM_IMPORT",
    "external_id": null,
    "external_source": null,
    "created_at": "2026-01-14T09:22:41.478363Z",
    "updated_at": "2026-01-14T09:22:41.478363Z",
    "created_by_id": "16c61a3a-512a-48ac-b0be-b6b46fe6f430",
    "updated_by_id": null
  }
}