Files missing after switching from Google Filestream to Google Drive
Solution 1:
This was a false alarm. I will delete the question.
When I switched over to Google Drive, it removed all the available folders from local access. Immediately after installation those folders were not available. After letting the program run overnight, it eventually synced them again and the folders are now visible and usable via Windows Explorer. I was panicking.
When you switch over, don't panic. Allow Google Drive several hours to sync if you have a large volume of material you need access to.