There are several ways to make short animation/slideshow. The way I'm most familiar with are .gif's. I was reading though the SP specs and SummitPost accepts picture formats jpeg, bmp, and gif; as long as they are fewer than 8mb. Gif’s can be animated using a number of different software (I use Adobe Premiere Pro and there may be some freeware on the web). When you make the animated gif you have to make sure the size doesn’t exceed the 8mb (or sp will not except it) so I used 3 frames per sec (at that rate you can make about a 20sec video/sideshow).