Google account users that back up new photos and videos in High quality will have these files counted towards their free 15 GB storage limit starting June 1, 2021.  Google will provide a free tool in June 2021 that will let users find and review low-quality photos to stay within the free 15 GB storage limit.   Additional file storage can be purchased from Google One, if needed

Another recent Google Photos change is the ability to save photo attachments in a Gmail message directly to Google Photos with a new “Save to Photos” button (JPEG images only).