To get started, go the + button then Apps and select Google Drive to enable it. You can choose to enable it just for you, or you can select which libraries you want to allow it for your students too. You can also access and enable Apps from the Teacher Dashboard. On the top of the screen, you will see the tabs for Libraries, Discover, Learn, Certification, and Apps. Simply go to the Apps section and enable or disable the apps of your choice.
To use Google Drive in Book Creator, click on the + button, then Apps and choose Google Drive.
You'll be prompted to sign into your Google account and grant access to Google Drive for Book Creator. Once you've done that you'll see your file picker screen - just click on the file you want and it will add to the page.
Note: Google Drive is a 3rd party integration which we cannot control. Some teachers report that they can't always see all of their files. If that's the case, you can try searching for a file by name .
Alternatively you can create a new folder and see if that displays when you look for it. If it displays then it would be a good idea to put all the files you and your students need in that folder.
Also see: How do I revoke access to Google Drive?