App suddenly won’t let me select videos – Video Rotate And Flip Review

Since I cannot find an email address to this app’s developers on the website listed in the app’s Apple description/product page, I’ll write the problem here. I’ve been using this app for a few years with no issues but today, I could not get this app to allow me to select the videos. Just the spinning waiting icon at the “Select your video” screen. Won’t let me go past that, no matter what I do. I hope you’ll fix this issue. iPhone 6S and iOS 12.3.1.
Review by An_Apple_user on Video Rotate And Flip.