Not ok – Slow & Fast Motion - Video Speed & Slo Mo Edit.or Review

I downloaded the first time and paid for the upgrades and every time I submit for final video, it shows a black screen but plays the music. So I deleted it and re downloaded it and the app is wanting me to pay again for the upgrades!!!! Horrible.
Review by jaylunng on Slow & Fast Motion - Video Speed & Slo Mo Edit.or.