What I’ve been looking for buuut – Video Grid - Instant Collage Make Review

This app is exactly what I’ve been looking for. Buuuut the only problem is, whenever I finish fitting the videos into their frame how I like it and press next, it always crashes! So I have to start over and don’t know if each video will play at the same time? Can you please fix this?
Review by CatNoir'sCataclysum on Video Grid - Instant Collage Make.