This is to help mainly Windows users but there has been problems on Macs too.
Google File stream has a bug that makes it so it doesn't load all of your files. Don't worry this is a quick and easy work around but google is working on a update that will fix this.
Windows -
Click on ^ in the bottom right hand corner.
Then this will pop up. Click on the google drive symbol.
After this will show up.
Then you need to click on the gear and click on Preferences.
Then this will pop up.
Then you click on disconnect.
Then you will do steps 1 and 2 to re sign into File Stream.