There was an error downloading this photo from your iCloud Photo Library
I'm on iOS 9 beta in my iPhone 6 Plus. I use iCloud Photo Library. I set the option for optimized storage. The expected behavior is that I can click on a thumbnail and the full picture downloads. For weeks this has not been the case. Instead in the lower right hand corner of the photo is an exclamation point in a circle. If I click edit I get the error message that is in the title of this post.