I set up nextcloud for my students to upload their papers / homework.  I set up a user account for each student with folders for the different courses. Each course folder is shared with the respective teacher for wich I also set user accounts. Teachers can add files but not delete or change files.  As an admin I would like to have a view where I can see all folders/files of all users. I expected to see all those in my (admin) account but I only see my own folders.  Does every user have to share ...