Each Shop listing supports at most one product video, and it must be 5 MB or smaller. Larger files fail the upload check.
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.