applications – Does MMS messages with pictures always use your data?

I have the Pixel 3a running android 11. My Wi-Fi is always on. And my mobile data is always off. I have the app “My Data Manager” installed so I can see when my mobile data is being used. When I send an MMS text, no data is used. But when I send a MMS text with a pic, then I can see that my data is being used. The following app is using the data “org.codeaurora.ims”. Is this normal? Because my phone plan is supposed to offer unlimited text messaging with pictures. But everytime I send an MMS text with a pic, it’s eating away at my data plan. Thanks for your help.