Now you can comment to albums in Google Photos
Google is updating its Photos app regularly with new features. For example, with the last update, they have added the switcher to the bottom of the screen and improved the search functionality. Google, again, released a new update allowing users to comment.
However, you cannot comment on every single photo that you have on Google Photos. If you have shared photos in an album ( again, shared album ), you can comment on that photo. The other feature that has been added to shared albums is the smart suggestion which particularly makes it easier for you to add photos to shared albums by showing suggestional photos from your own picture library.
Via – GSMArena
Source – Google on Google Photos