Let's show you how to fix Android's File Manager.
In this video, I walk you through the steps to fix when the File Manager on your Android phone or device isn't working. First, restart your phone and test if this solved the problem. If this doesn't work then go to Settings, Apps, and then File Manager. On some phones, it's called My Files or Files. Once you have opened Files, then click on Notifications, switch off Notifications, go backward 1 screen and click on the three dots at the top right and then Uninstall Updates. Test to see if the issue is resolved. If not, then while in the My Files app, scroll down and click on Storage and then Clear Cache. If this does not resolve the issue then go back to the main Apps list under Settings, click on the three dots at the top right, click on Reset App Preferences and then Reset.
I hope this video helped solve your problem. App still not working? If so, drop your question in a comment below!