Unable to send images and videos over iMessage - Message Failed to Send
I've been unable to send images and photos with iMessage. The delivery is attempted but it slows and I receive a Not Delivered warning and a notification Message Failed to Send. I've had no luck solving this problem with any of these steps:
Restarting the iPhone
Turning iMessage off and back on. And tried turning iMessage off, restarting the phone, and turning iMessage back on. You can do this from Settings -> Messages, and then toggling the iMessage toggle off and on.