For the hidden and system files.
Open the file manager. Select view on the top menu. Over on the right, is a small iem "options"
click it and select view.
Scroll down and select to show
1. Hidden files folders..etc
2. UNhide the protected operating system. You will get a popup warning, which you can, at this stage, acknowledge as YES. Remmeber, though, to reverse this process when you are finished with the examination.
You should now be able to see some unidentified folders. Look particularly for any which are starting with an asterisk of dollar sign.