Expire temp links must be at least 1 minute
Saving Files settings failed because symlink_expire was less than 1 or not a valid number.
Why this happens
Prevents zero/negative temp-link TTL. Paired with the 7-day maximum validation.
Diagnose and fix
1. Set Symlink expiry to at least 1 minute.
2. Use a whole number of minutes (not empty/NaN).
3. Save and mint a test download link to confirm TTL.
4. Very short TTLs may confuse users on slow pages — pick a sensible default.