How to show "files" tab

Hi! ... some weeks ago I’ve set do don’t show (for a specified user) "files" tab ... but now I don’t remember how to show it... how Can I allow specified user to show files tab?

Thanks

Maybe changing the access policy helps?

-> Security/Access Control -> "Access Policies" tab
-> Pickup the desired access policy, switch to the "Permission" tab and add the "file_tree" permission.

Hope this helps...