Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
In Android 8.1, Settings > Apps > Firefox > Storage > Clear Cache. Older versions of Android will be similar, though the Clear Cache button may be prominently displayed instead of hidden beneath Storage.
If you want another alternative, install and run SDMaid.
I suppose when u run a File recovery app it discovers what's left in the tab's HD from video/pics that've been deleted.
Am I right?