Video does not work – Prisma: Photo Editor, Filters Review

Works great for still photos but video does not work for me. I am using iPhone X and iOS 11.1.1 - when selecting a video it chooses it and asks me to select a 15s portion, and then after selecting an effect it does the triangle progress bar for awhile and then just shows me the original clip. I have tried restarting the phone and killing and restarting the app.
Review by NathanielR on Prisma: Photo Editor, Filters.