Upload slot id
Returns the slot status
Status of an upload slot returned from GET /media/uploads/{id}.
The upload slot id.
The current state: pending (awaiting upload), uploaded (object present, not finalized), or completed (media record created).
The S3 object key for this slot.
When the slot was created (UTC).
When the presigned URL expires (UTC).
The created media id once the slot has been finalized; otherwise null.