I was able to get a screenshot.   

I am having the same issue. I want to update the title & description of some of my collections and I keep receiving the brief message that it could not be saved. 

Never mind. It was a fluke. It went back to not working. 

Add an item to the inventory, then try adding a photo! I was just dealing with the same frustration & tried that on a whim. After adding 1 to the inventory, it let me open the photos.