Thank you TD. The lesson for me and for others who may be interested is this:
When the end result you want is a slide show, be sure to bring all the photos together in an album, do the arranging and order and cropping in the album, and then transition to the slide show to add music, timing and special effects. If necessary to then add more photos or change the order, go back to the album, make the changes, and then save as a new slideshow. This can be frustrating, because it will mean setting the music, timing and special effects of the slideshow again --
Interesting...
But thanks, TD -- appreciate your time.