Can’t Receive Photos or Videos Sent via iMessage

All of a sudden, whenever somebody sends me a photo or video via iMessage, I can’t seem to view it or see it. It just shows up as a file. I try pressing the download button, and it still won’t even work. My network connection is strong, my storage is low, and my MMS messaging is turned on, so I am not sure what the problem could be. If anyone thinks they could help, that would be very much appreciated. Thank you.