I have KDE's [Spacebar][1] installed on my Librem 5 but cannot figure out how to access/receive MMS messages.

(edited image example)

[![Screenshot of Spacebar with MMS Message][2]][2]
[![enter image description here][3]][3]

Have any of you been able to receive MMS messages? I am attempting to receive cat photos.
The screenshot was taken on Mobian.

**Edit**: I am using AT&T (sometimes refered to as ATT) but would prefer a carrier-independent solution so that other may recieve help here as well


 [1]: https://apps.kde.org/spacebar/
 [2]: https://i.sstatic.net/HlbV3nxO.png
 [3]: https://i.sstatic.net/JK66Up2C.png