attach_artwork
ChatGPTUse this to set the image printed on one line of a draft cart: a different design for that line, the person's chosen new design, finishing a workspace-file upload (upload_id from start_artwork_upload), or retrying when checkout_session came back with no artwork. Reports print quality at the chosen size. Nothing is ordered or charged, and no file is deleted: a previously attached image stays stored and can be attached again.





