Thanks for checking it out.
1. Currently it's a web-based video editor (so no download required) where you edit screen recordings, so at the moment you'll need to record your screen and then upload it.
2. I see, maybe adding a "skeleton" loader overlay over content that's not affected by the core feature would handle this? e.g. something like this: https://twitter.com/SlackHQ/status/1275154148938461185