Accepting a shared album invitation allows you to access photos and videos shared with you by other users. You can accept shared album invitations through the Photos app on your iPhone, iPad, or Mac, or through the Google Photos app on your Android device or computer.
To accept a shared album invitation, open the invitation email or message and click on the “Accept” button. You will then be prompted to sign in to your Google account (if you are not already signed in). Once you have signed in, you will be able to view the shared album and its contents. You can then choose to download the photos and videos to your device, or you can simply view them online.