I’ve been with tmobil and apple techs on the phone for over a week about this problem of group messaging. One suggested to change SIM card or do a factory reset. I changed the Tmobil Sim and it worked for while and then it crashed. I am going to call them again. Honestly you aren’t the only one having issues sending pictures or videos. I’ve been reading a lot about it on and off this forum. I have the same issue, and nothing fixes it.
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