After working with it more, I can clarify what problem I am having. When I want to insert a photograph into the middle of a slideshow I am creating, I position the slideshow with the area where I want to insert the slide so it is displayed onscreen. Then, when I try to drag the photo down, as soon as I enter the slideshow area, the slideshow area immediately returns to the very first slide, and I can no longer see the section where I want to insert the slide. I have found a kludge that SOMETIMES works, but I would like to find how to do this correctly. If I put the red slider bar on the slide that I want to insert either before or after, then compress the slideshow as much as possible, so it doesn't take up the entire area, i.e. the first slide is already displayed, I can then drag the photo directly above the red slider bar, then down into the slideshow area. That is a very awkward thing to have to do.