Blocked file extensions
Blocklist. Always refuses these extensions on upload and public download when the list is non-empty.
Where to find it
Admin → Settings → Files → Uploads → Blocked file extensions
Setting key: ext_not_allowed
How it works
Typical blocks: exe, bat, cmd (your risk tolerance). Works even when Allowed file extensions is empty.
If both lists are set, a type must pass the allow list and not appear here — overlap → blocked.
When a blocklist is active, uploads without an extension are rejected too.
Common problems
Software hosts blocked
You blocked exe / dmg / apk. Remove those if that is your niche.