If you want to Blrt over images added from Google Drive:- Start a new Blrt.
- When the 'Add pages to Blrt' screen appears tap the add page button (a page with a '+' in the middle).
- When the 'Add media' screen appears select to add an image.
- Tap the 'iOS locations' icon on the 'Image' screen, that will open a menu, select the 'Google Drive' tab.
- Add or select the account with the drive you want to access, then select the images/photos you want to add.
- Once selected Blrt will open and add your media as a page in your Blrt.