I am working with about 150 images in the timeline. 130 or so are in landscape mode and the rest are in portrait mode. Is it possible to attach "black sides" to the portrait mode files so that they completely overlay the image that they are on top of? The problem becomes a real nuisance when I am dissolving from landscape<>portrait image. The sides of the portrait file remain as the old image instead of a nice black BG appearing. I hope this makes sense and is solved easily!