I haven't used the app much myself so far, but the few times I did, it seemed to me that the videos use a pan and zoom effect like many other slideshow apps do. Means a picture may appear zoomed in, then the view moves from side to side or top to bottom, zoom in or out and so on.
I wish that was the case.. Most pics are just being cut off.. I wondered if it was just an issue for my phone so I uploaded the vid to onedrive and then played it via my laptop, but the result was still the same