Files list displays for items on phone and on Google drive. However, tapping does not open them. Can't open any file. I checked the FAQ, couldn't find anything useful there. Tried selecting the experimental option. Didn't help.
Some questions: 1) Is the "Files list" you refer to a file manager app or is that (also) the case when trying to open files from within the app, i.e. starting LibreOffice Viewer and then tapping on "Select File to Open"? Both ways should work, but some file managers don't pass the files correctly, which could be related here. 2) Does anything happen when you tap on a file (like some error message being shown) or is there simply no observable reaction at all? 3) What's your Android version? 4) How did you install LibreOffice Viewer (Google Play/F-Droid?)? 5) Does uninstalling and reinstalling the app make any difference?