using photos to create a slideshow video

Hi - I created an album of photos in photos on my macbook pro and played them as a slideshow using the vintage print theme and associated music. Love how it came out so now I’d like to save the slideshow as a video, but I can’t see an option to do that using the vintage print theme. When I right click on the album, and choose create, slideshow, photos and then export the slideshow, the background reverts to just a black background.

Is there any way to save the vintage print theme/music to a video?

This video I’m trying to create is for my son’s wedding on Sunday. Really appreciate any information anyone can share if this is possible to do.

Thanks so much. Jeannie