Hello - I have a Macbook Pro that is operating on OS X El Capitan version 10.11.6. Until two days ago, when someone would send a picture through messages, could see the picture. For some reason, I am not longer able to see the picture, and it wants me to download the photo. At the same time that I cannot see the photo on my Mac, I can see it on my iPhone. What is going on? How can I see photos that I am receiving, within messages? Thank You - Robin