How to setup a new user access to the file page

I want a user to have access to a specific folder of the file page so that they can make use of the Upload button.

When I give a Role access to the file app, and the correct folders as in … images/* , it works okay on the admin login, but not when I assign a user to that role.

When the user logs in – to the console, he can see the file GUI, but there is no folder displayed and all buttons are greyed.

Any idea how to set this up so that roles can access using the nice built-in GUI?