Postfix
Inserted before the last dot in stored names when Download link format is the with-filename option (link_format = 2).
Where to find it
Admin → Settings → Files → Downloads → Postfix
Setting key: add_filename_postfix
Allowed characters: letters, digits, _, -.
Example: _my-brand → movie_my-brand.mp4
How it works
Applied on upload paths when the filename format is active. The admin field is often read-only while format is short-id only (5).
Common problems
Postfix missing in URLs
Link format is short-id only — switch to with-filename format first.