Log out of Cydia. On your device’s home screen (usually page 3 or 4), you will find the icon (blue folder with a white "F"). Tap it. If it opens without crashing, you have successfully completed the Filza File Manager iOS 9.3.5 download and installation.
iOS 9.3.5 is notorious for filling up with "Other" storage. filza file manager ios 9.3.5 download