Enter one or more URLs
The product asks for URLs because the Remote URL box was empty (or only whitespace) when Import was clicked.
Why this happens
This is client validation before any API call. The uploader splits the textarea by line, trims each line, and drops blanks. Zero lines left → message: “Enter one or more URLs (one per line).”
It is not a plan block, size limit, or DNS failure.
Diagnose and fix
1. Paste at least one full URL, one per line (e.g. https://example.com/file.zip).
2. Remove blank lines if the field looks empty after paste.
3. Agree to the TOS checkbox if the form requires it, then Import again.
4. If the Remote URL tab is missing: admin must enable Mods → Remote URL upload and not block remote URL for that tier.