I exported the Slideshow I created but the sound is not there ?

Hello ZRphotography,

We'd be happy to help.

Export photos, videos, slideshows, and memories from Photos on Mac -- Are you following the steps provided in this section on this page of the Photos User Guide?

When you created the slide show did you add custom audio or are you trying to use audio from videos in your library?

If you play the slideshow before exporting it, do you hear any sound?

Cheers!