T-Mobile S6 not sending MMS properly

[winterhelm]

I have a T-Mobile S6 and used to have a Verizon S6, the way MMS messages are sent with the T-mobile verison is wacky. I can't attach the photo and caption it or write a message with the photo like I could with the Verizon version.

This can be fixed but I can't figure it out. for some reason my Wife's S6 started doing it randomly where she could embed text into the photo when sending an MMS.

anyone know?