mobile

I've searched Google and these forums and still don't have an answer. I keep getting pop-ups from Textra saying that it can't receive MMS. I reset my phone, I've re-typed all the APN settings, including the default ones found here. I've searched for ATT size limits, etc., and still I can't receive pictures. Does anybody have a solution? I'm rooted and on Android Revolution ROM, but these issues persisted even before both of these things.