In-App Purchases
It can only do 1 minute clips, and requires you to purchase tokens. They give you 10 free, but it was 120 for the 53 second clip I tried.
Not enough ratings yet to assess Upscale Video.
Upscale Video appears legitimate, with a few gaps. AppsHunter Legitimacy Score for Upscale Video is 65/100.
Based on 65 of 100 points across 7 verification signals from App Store and developer data.