I was setting up a new iPad, all went well. Then I openen the Photos app. I saw some photos already (probably synced) and then Photos asked me if photo sharing should be turned on. I turned it on, but then all my photos disappeared. I logged in on icloud.com and there I could not see ant photo either. What is going on? Am I doing something wrong? I already made a backup of the iPhone so I know the photos are somewhere. However I don't dare to open Photos on the iPhone as I'm afraid the photos will disappear there as well.