Using Google Drive Problem

I have never used Google Drive, RealMac does not recommend you use cloud storage. Many folks do use Dropbox, but you need to be careful in making sure they have time to sync.
The other thing you could try is to close the project file on one computer and then zip the project file and place it on Google Drive. On the second computer unzip the project file.
You may want to check out this post, it’s about Dropbox but may give a clue to the problems your having with GoogleDrive: