If you run into an issue where your G: drive either isn't showing up, files aren't updating, or G: drive isn't available, then the Drive File Stream app probably needs started or restarted.

To fix this, simply click the Start button, find Drive File Stream, and click it. If your login info is saved, this should immediately start Drive File Stream and your G: drive should become available in just a few seconds.

If your login info is NOT saved, you should be prompted to re-enter your Drive File Stream login information (your work email address and password.)