The Documents tab has been deprecated and can no longer be used for uploading files. Documents has instead been replaced with Custom fields. You can add multiple custom fields and if you want to upload files, just choose file as the type when setting up the custom field in the settings.
Opening a file
Simply click on the ↗︎ icon and the file will open in a new window. From there you can print or save the file (right click to save).
Deleting a file
Click on the trash icon to delete the file from the user's account. Once deleted, the file cannot be recovered and would need to be re-uploaded.