Google File Stream

This handy little installation will allow you to access your google files straight from your desktop, adding a folder to your iOS finder.

Click this link - download for mac and it then install - this will solve your problems (this site has more info).

If it doesn't work straight away, one additional step that you may need to do..

1. Open Drive File Stream.
2. At the top left, go to System Preferences Security & Privacy.
3. At the bottom, next to "System software from developer "Google, Inc." was blocked from loading," click Allow.

If all runs well in finder you should see google drive in Finder.