Although the Uscreen platform is built to sell your content, you can offer some content for free to attract users to your store. Your free content could be the intro videos if you are selling a collection. Or you could add teasers so your users can see what each video is about.
Here are the types of content and offers you can give away for free:
Subscriptions (Create a set amount of free subscriptions via coupons)
Check out each one of them to know how you can implement this into your store.