File management permissions are defined by WordPress user roles that get possibility to execute some specific actions on files and categories. All the users in a WordPress User Role are seeing permissions applied to their account. That includes:
Permissions to create new file categories
Permissions to edit existing file categories
Permissions to edit their own file categories (not others)
Permissions to delete file categories
Permissions to access to WP File Download file manager
WP File Download can allow your WordPress users to manage their own file repository because you can define, as an admin, who own a category of files. Based on that, the user can have access only to his categories and files. A single user can own several categories of files.