I'm having trouble getting the picture I want to use to move correctly with the placeholder included in a template I am using. Rather than type out the full nature of the problem, I made a 59 second video that shows what is wrong, what it should look like, and a few screen shots that show the current settings I am using.
You want to precompose your stills and the track mattes together. The composition should look like the stills with a rounded rectangle border. Then animate the composition.