I'm a tech in Montreal using win 7 but set up win 10 and had this same problem . For photos I think you clicked on the photo app and tried to paste but can't. You are assuming that photo app opens the "picture" file but it doesn't . To paste a photo copy like your doing then open this pc and find the "pictures" file open that and paste will work. I made the same mistake myself Paste will work here I tested it even with the newest update applied. I think others are making the same error, make sure
you are really actually in the older programs that already allowed pasting and they will work.