Create a presigned upload URL for a media file.
Request to create a presigned upload URL.
Filename with extension (3-255 chars). Accepted: .mp4, .mov, .png, .jpg, .jpeg, .webp
Successful Response
Response with presigned upload URL and beeble:// URI.
Upload ID (upload_...)
Presigned PUT URL for uploading your file. Expires after 1 hour.
beeble:// URI to reference this file in SwitchX generation calls (source_uri, reference_image_uri, or alpha_uri).