If a photo is not in the Trash, it may have been permanently deleted. This happens if you manually emptied the Trash, if the 30/60-day window has expired, or if the photo was never backed up and you cleared your phone's gallery.
Navigate to (or the Library tab) and tap Trash (or Bin). Touch and hold the photo you wish to save. how-to-recover-deleted-photos-from-google-photos
To recover deleted photos from Google Photos, your first and most reliable step is to , where deleted items are temporarily stored for up to 60 days if they were backed up. If a photo is not in the Trash,
for items that were backed up to your Google Account. if the 30/60-day window has expired
Open the Google Photos app (or photos.google.com on a computer).