Additional images (additional_image_link) were not provided. TikTok flags this as a quality issue that limits ad performance and shoppable surfaces.
TikTok Shop / TikTok Catalog Manager requires product images that are publicly reachable, sized within the platform's bounds, in supported formats (JPEG/PNG typically), and free of overlays, watermarks, retailer logos, or text callouts. This issue trips when one of those constraints is broken.