When I am host using Zoom on a Linux machine and I attempt to play an mp3 for the meeting participants they cannot hear it.
I found a Windows machine and installed Zoom on it, then set up a second user.
With User 1 as host on the Linux machine running the Zoom client application I invited my user 2 via a web link.
As User 1 I attempted to share an mp3 by selecting ‘share screen’ and ‘share music or computer sound only’. I then selected an mp3 on the Linux desktop and played it.
The sound was clearly audible on the host machine but the user 2 machine was receiving nothing at all. I checked the sound settings on both machines and they were functioning as expected.
I repeated the test, but with User 1 as the meeting host on the Windows machine and User 2 as the guest on the Linux machine. The shared mp3 was now audible on the Linux machine, albeit with a 1 or 2 second delay, which I imagine is to be expected with the round-trip to the ISP.
Conclusion - sharing computer sound is non-functional via the 5.0.418682.0603 Oliver Grawert version of the Linux software DL’d from Snap Store. & updated on 10 Jun 20