Pre-loaded slideshow songs can be accessed under Design Library > Download Songs from the top menu or by selecting "Download" under the music in slideshow settings.
Under the Music tab in the Design Library, filter by Type and click on Download next to a song. Once the song has downloaded, press the play button to preview it.
All downloaded songs will be available in the slideshow options for future projects!
Slideshow music is only available with a Pro Enhancements subscription. To learn more about Pro Enhancements features and how to subscribe, click here.