Signal and MMS don't work

Hi folks,
I’ve difficulties receiving MMS with Signal. Asked the sender to resend after changing back to stock Messages App, MMS works fine there.
Checked all settings mentioned here:

Switched on/off WiFi call.
Checked APN.
No effect…
Any Tipps?

Maybe I live in a different bubble, but no one has ever sent me an MMS in my life. I would deliberately ignore this “issue” and simply ask the contact to use Signal as well.

On a different note, there is a lenghty (!) thread on this over at

I receive MMS I guess twice a year or so…
Thanks for pointing me to the github thread.
Suppose I’ll return to native Messages App.