Verizon MMS doesn't work

I cannot use group chats or send pictures on Verizon with graphene os.
It happens on all phones. Is there an issue with the baseband?

Hello,

Please read this part of the official usage guide:
https://grapheneos.org/usage#carrier-functionality

MMS is just a broken outdated protocol.
AOSP does not support most of MMS features by default.

If you want to have proper private conversations (and group chats), be able to send and receive photos, videos, and other types of media use Signal.