Login as the user and click the Sharing link in the Files tab as shown in image.

File not visible to admin – Scenario #3: The user is uploading into a shared folder, however, the admin still cannot see the files; this could be because the admin was not given proper permissions on the shared folder. If the admin was only given write access on the shared folder, the user needs to give the admin read access as well. This will allow the admin to see all files in the shared folders.