Mms not working topic

I've had my G3 awhile now and have always had problems with mms. Had an hour long talk with a bell tech not to long ago.. Got it to work.. (data would not work.. No Internet or anything). I was using textra at the time, now the only messaging app that works for me is textra. Even the stock app will not send mms nor will any others but the I have Internet. So that part works it just will not download or send any mms with any message app other then textra.
I'm baffled, I've tried everything I can think of and have read about. I've been through the APN settings about 3 times now.. Everything is correct there..not what what to do now.
This is on bell network with the International version (D855)