Install
This is the repository archive. It installs, but the folder name will carry the branch suffix and updates will not flow.
Install straight from GitHub with WP-CLI:
wp plugin install https://github.com/jumbojett/wordpress-media-integrity/archive/refs/heads/master.zipNo built-in updater. New versions won't appear under Dashboard → Updates. Install new releases yourself, or let Git Updater track the repository.
Wordpress doesn't verify file extensions when media is uploaded. This plugin will detect the filetype and append the correct extension if it is not present.