[Zubersoft]

I just logged in to Google Drive in MobileSheetsPro using my GSuite account and it all worked fine. So I don't think that's the issue. You don't have multiple email addresses you use with Google Drive by chance, do you? I just want to make sure there isn't some kind of discrepancy between the email address you are using to log in to Google Drive when using a web browser versus the one you are selecting in MobileSheetsPro. I'm definitely struggling to figure out why you wouldn't see any files. I should also mention that if you are using Import->Google Drive in MobileSheetsPro, it's only going to show you supported file types (PDFs, image files and text/chord pro files). Other file types will not be shown as it filters those out.  What types of files are you expecting to see?

Mike