To go back up, tap the folder’s name at the top-left corner of the screen and tap one of the parent folders.
Browse the file system: Tap a folder to enter it and view its contents.How to Use Android’s Built-in File Manager
Of course, you can’t access the full root file system without a third-party file manager and root permissions. Android is actually presenting the file system here - the same file system you’ll see in third-party file management apps. This will take you to an interface that allows you to view and browse your device’s internal storage or external SD card storage. RELATED: How to Manage Files and Use the File System on Android To access the file manager, scroll down to the bottom of this list and tap the “Explore” option. Tap a category to see what’s using space and choose what to remove - for example, tapping “Apps” will show you a list of your installed apps with the largest apps first.