CreateCustomImageResult

expiresAt
Type: stringFormat: date-time
required

When the presigned URLs expire (default 1 h after issue).
imageId
Type: stringFormat: uuid
required

ID of the new image record, in pending state.
parts
Type: array of object
required

Pre-signed PUT URLs, one per part, in ascending partNumber order.

Properties: 2
partSize
Type: integer
required

Size in bytes of each part except the final one (default 16 MiB).
uploadId
Type: string
required

Opaque upload-session identifier returned for client reference / logging. Do NOT send it back on the complete call — that endpoint's body is .strict() and only accepts parts; the server tracks the uploadId server-side via the imageId in the URL.