How do I create a slideshow from within PhotoShop?

Hi Don, 

Thanks for posting on Photoshop community.

Photoshop is not the ideal app to create slideshow. We'd recommend that you use Lightroom Classic or Photoshop Elements to create slideshows. See https://helpx.adobe.com/lightroom-classic/help/creating-slide-shows-basic-workflow.html 

However, you may still be able to create slideshows in Photoshop. Checkout this article for more details: https://jkost.com/blog/2014/12/creating-a-simple-slideshow-in-photoshop.html 

Let us know how it goes.

Thanks,

Akash