When I go to my google drive I get the warning "You are using an unsupported browser. If you see some unexpected behavior, you may want to use a supported browser instead."
I have to say that, using Edge dev (18.104.22.168) to work with documents in my google drive, there is no "unexpected behavior" so far. I do, however, expect from the Edge dev team to step forward in a deeper collaboration with Google and eliminate any kind of incompatibilities. Besides, this was the primary reason that Microsoft adopted chromium: "Microsoft Edge and Chromium Open Source: Our Intent".