Before you can view your data across all devices, you need to back up your iPhone data with the Google Drive app on your iPhone.
After you back up
You can see and use all your content across all your devices after you back up.
- You can see and edit your photos with Google Photos.
- If you organized photos into albums, those albums will not back up to Google Photos.
- You can see your contacts at contacts.google.com.
- Your contacts from your iPhone and iCloud will be in a new group named after your device.