Pls read – Video Merger Pro-music editor Review

I don’t know if it’s just me but all of the sides accept landscape cut of my video but when I do do landscape it works but it’s pitch black! I don’t know what’s wrong with it but either fix this or let me know what’s happening. I’ve tried so many apps cause I need to merge 2 videos for my YouTube video but every app has at least one problem or bug. I thought this app would be the one cause it’s 1.99, But I guess not. Please read this and tell me what’s happening and tell me if I can fix it or if I just delete the app. I’d also like to give this app at least a 4 star review, but I can’t if it’s not true.
Review by Megan+Minecraft on Video Merger Pro-music editor.