This file type is not allowed
The file’s type or extension is not permitted for upload (init, API, remote URL, SFTP ingest, and site extension policy).
Why this happens
Two layers:
1. Hardcoded dangerous MIME/extensions (e.g. executable-style types)
2. Site lists: if Allowed file extensions (ext_allowed) is non-empty, the extension must be on it; Blocked file extensions (ext_not_allowed) uses a related “blocked” message
Copy-from-public may say This file type is not allowed on your account for the same MIME check.
Diagnose and fix
1. Admin → Settings → Files — review Allowed file extensions and Blocked file extensions.
2. If ext_allowed is set, add the member’s extension (or clear the allowlist to allow all non-blocked types).
3. Remove the type from the block list if it was blocked by mistake.
4. Member: rename only helps if the real type/extension is allowed — don’t rely on fake extensions for blocked binaries.