I tried several UMIDIGI phones and all came back with the same problem. I cant send or recieve Pics on MMS.
I have a basic talk and text plan with FIDO.
UMIDIGI did do an upgrade on Aug 1 2020 but still nothing. The APN cannot be altered. The Phone is on Android 10.
PS. I did use a MOTO G8 Play (International Version from Amazon) No problem. Put in my sim card no problem.
I had this issue as well. I have searched and tried everything. I went I to a Fido store as well as the hour or so on the phone with Fido tech support.
Finally I email Umidigi tech support through Amazon and they told me there is an update that fixes this! Go to settings, about phone and click on wireless update. This worked for me.
Let's hope that this fixes the MMS issue for all of us! Good luck.