Paste a public download link from this site
Copy from public could not resolve the pasted text to a public file on this site. Product text fills in the site name: “Paste a public download link from {site}.”
Why this happens
Wrong origin, bad path, invalid file id, or a link from another host. Allowed origins are typically the request origin plus PUBLIC_APP_URL. Empty paste is a different client message (Paste one or more download links).
Diagnose and fix
1. Member: paste a full public download URL from this site (one per line), not a third-party URL.
2. Admin: ensure PUBLIC_APP_URL matches the hostname users copy from.
3. Confirm Copy is allowed (mod + tier not blocked).
4. If the file id is valid but private/deleted, other copy errors may appear instead.