Upload an attachment for a registration
Attach a file to a registration in the resolved organization, as multipart/form-data with the file in the file part. Any file type is accepted, up to 10 MB. Returns the stored attachment's metadata. Returns 404 if the registration does not exist or belongs to an organization your credential cannot access, and 413 if the file exceeds the size limit.
Authorization
Headers
Release date, as YYYY-MM-DD. Defaults to 2026-07-21.
Target organization id (Organization-Id selector).
Target connection id; resolves to its organization.
Platform entity id; resolves to a connection's organization.
Optional source to disambiguate an Entity-Id.
Path parameters
The unique identifier of the registration.
Response
Kintsugi's unique identifier for the stored attachment.
The uploaded file's name.
The uploaded file's MIME type, as sent by the client.
The uploaded file's size in bytes.
When the attachment was stored, as an RFC-3339 UTC timestamp.
Successful Response
The request was invalid.
Authentication failed or was missing.
The credential is not permitted for this request.
The requested resource was not found.
The request conflicts with existing state.
The request body is larger than this endpoint accepts.
The request failed validation.