I have a iPhone XR and my wife has a iPhone 11. Up until about a week ago we could sent photos to each other via iMessage. Now we both get messages saying sending failed, text come through no problem. We are both set up as family members and we both can receive photos from other iPhones and android phones. I did try all the suggestions I could find on Google. My next option is to wipe both phones but I really am trying to avoid that. My wife's iPhone does only have about 5GB of storage free and her 5GB of iCloud storage is full, could this be the problem? Desperately looking for answers or ideas to try.