Android beta version screen sharing

Hi, I have downloaded the apk version 20.5.0 from aptoide is that the beta version ? How can i be sure it’s the real beta version ?
If it’s the real version, the screen sharing from android device seems to be only working with 2 participants.
By the way how could we help you during the betatest ?

It’s seem to be working on the official server, does it only work from a specific version ?