we (2 Fairphoners) have a very annoying problem with sending MMS from one Signal app to another:
1st FP2 (German Vodafone) - vfp
2nd FP2 (German O2) - ofp
Sending encrypted MMS (emms) from ovp -> vfp works perfectly. The media is received and decrypted.
Sending emms from vfp -> ovp only works partly. The media is received but not encrypted. The incoming message looks like a base64 coded string - long enough that it could be the small test image sent.
Besides from that - normal SMS are working like a charm in both direction.
I’ve read a statement somewhere, that some providers are fiddling with the resolution/file size. Resulting from that, I fear the server has no idea what is coming and executes its scripts to resize the emms. Of course, the message transmitted to the end point is now destroyed.
Does someone has any idea what is happening, whether my thoughts could be correct or if there exists some way to backtrack that problem?
We appreciate any help!