Problem with Google Drive I have Google Drive installed on my iMac running High Sierra. I have a folder on my machine named Google Drive. I haven't used it in a while. I seem to recall that I once had a menu item for Google Drive. Well, I no longer have a menu item for Google Drive and if I open the Google Drive folder there is only a few MB's used. 

If I go to Safari and go to Google Drive it says I'm using over 10 GB of my allotted 15 GB and it lists the files which I remember copying to the drive about 2 years ago. Have things changed for Google Drive? Why does the Google Drive folder not reflect what is actually on my Google Drive? At some time in the past, I copied close to 10 GB of data to Google Drive. I have no idea how to do that now.
Google Drive is a Online storage, not storing on your Mac.
Just like iCloud, one-drive and others.
What you have installed on you Mac is just the Google Drive app to manage online drive, not to store information on your Mac.
Go to your Google drive online (Log in) to see it directly. It will also show you how much storage you use and how much you have left.
Know that Google Drive also serves as storage for your Gmail.
If need be download and install the Google Drive app again.
I have 2 Google drives (one comes with each Gmail). I do not use the Google Drive app on my Mac (find it not nesessary). I go online log in to Google and can see and manage my drives there.