Does not work – Video Speed Editor - Slow and Fast motion effects for multiple parts of your videos Review

I downloaded the app then purchased the option to speed up or slowdown the video for $4.99. It takes a long time to prepare the video. Then once it is finished it closes the app and does not save. For reference I have an IPhone 12 Max pro.
Review by Ashley Dittmer on Video Speed Editor - Slow and Fast motion effects for multiple parts of your videos.