Sharing sound in Zoom
If you're playing a video or audio clip as part of a presentation in a Zoom meeting, you'll want to include sound from your computer. Here's how to do it.
Once you hit the Share button, click on "Share sound" and click on "Optimize for video clip" (for better video). Then just select what you are which desktop or window you are sharing and hit "Share".
For more details, go to this link, Sharing sound during screen sharing