((full)): How To Save Photos From Google Drive To Iphone
First, ensure you are looking at the "Send a copy" menu. If you are in the general file menu, "Save Image" might not appear. Second, ensure the photo isn't inside a compressed file (like a .zip); you will need to unzip it within the Drive app before you can save the image.
Method 1: Using the Google Drive App (Best for a Few Photos)
For multiple photos: