I’m sorry to hear that. I have only one more thing to try. This is from another user in a different thread, but about opening JPEG images in Messges, so I’m not sure if it’ll work for you:
- Please turn off iMessages in your settings.
- Turn off iPhone.
- Leave for 1 min.
- Turn iPhone back on.
- Go to Settings, and turn iMessages back on (wait 1 min. after doing so)
- Tap on JPEG files in your messages, and they will appear (some automatically)
If that doesn’t work, please Contact Apple for support and service - Apple Support.
I wish you the best of luck in resolving this issue! Have a wonderful day!