Audio in PPT is not audible for my students.

[jhna]

HI, When I share a PPT (from Microsoft) in Zoom, everything works perfectly: I can hear and see my students, my students can hear me, and we can all see the PPT. However, when I want to play a video or audio that is embedded in the PPT, they cannot hear anything, although I can hear perfectly on my computer. This has only just started happening; everything was working perfectly before. I'm not aware that I have changed any settings. Is it possible that an update has altered settings, or have I unintentionally changed any settings? I'm running Windows 11. Thanks for any suggestions.