Be careful when highlighting a title (or a description) of a photo. The photo itself can be accidently grabbed as well. Here you can see that both the title and the photo are highlighted and having used the delete key I get a pop up asking for me to confirm - but it is confirming deletion of the photo!! This action cannot be reversed.

I recomment using the backspace key when highlighting and deleting a text - that should avoid this issue of accidently deleting a photo.