Copy files not allowed for your plan
The member’s plan is not allowed to use Copy from public link.
Why this happens
Under Users & limits, each member tier has Block copy files (toggle.ul2_copy_block_reg / _prem / _prem_pro).
- Switch on = copy is blocked for that tier
- Switch off (or unset) = copy is allowed
The upload page and /api/upload/copy-from-public both enforce this.
Diagnose and fix
1. Confirm which plan the user is on (registered / Premium / Premium Pro).
2. Admin → Settings → Users & limits → turn Block copy files off for that tier if you want copy allowed.
3. Confirm the site mod Copy from public link is enabled (Settings → Mods).
4. If only one user should be treated differently, use a per-user limit override on that account (when you use overrides for ul2 keys).
5. Ask the member to refresh the upload page after you save.