Adding music to photo slideshow
How do I add multiple songs from my playlist to my Apple photo album slideshow?
iPad, iPadOS 16
On my iPad with iOS 17 I can currently only select one of my songs from the Music Library.
I am using the work-around to let my playlist play in the Music.app, while I am playing the slideshow without music in Photos.
You could try to create your slideshow in Keynote instead of using Photos. Then you have more control.