Can't send pictures as a text messsage.

I recently went to Xfinity mobile from Verizon.  I've read a lot about folks not being able to send pictures as a text message (MMS).  I am in the same boat.  Is there a workaround for this?  I read that turning off WiFi on my phone would do the trick but it did not.  I never had this issue while on Verizon.  The only 'pictures' I can send are emojis. Things such as animated GIFS and photos don't make it to the sender.  I did get a return message once stating that I supplied an invalid address which is not true.

Does Xfinity purposely curtail sending anything but text as a way to cut costs?  Any help on my problem will be appreciated.

This happens on a Motorola and Samsung phone.