DescriptionUploadTicket

A request or response body; the type column links to the schemas it refers to.

Field	Type	Required	Description
pathname	string	yes	Where the private blob will live; pass it back when creating the attachment. Not itself a URL.
upload_url	string	yes	PUT the file bytes here, with the declared content type.
expires_at	string (date-time)	yes	—

jsonExample

{
  "pathname": "string",
  "upload_url": "string",
  "expires_at": "2026-01-01T00:00:00.000Z"
}