First make sure you have connected your AWS account to your Google Drive. Once you have Google Drive connected you'll be able to browse to it in Blender using the steps below.
- Click File then Open or Save As you'll see a screen like this.
- In the navigation area click the up arrow.
- Then double click My Files from the list of yellow folders.
- Now you will see Google Drive listed.
If you do not see Google Drive listed use the steps in this document to connect your Google Drive.