The video above the fold on a landing page has one job different from every other video an app will ever need: it has to work before the visitor has decided to trust anything. They have not read the feature list, they do not know what the app is called, and they will scroll past in a few seconds if the video does not make the case for them immediately. That is a much narrower brief than a general demo video, and a Firebase Studio app built quickly often has a landing page written before the product itself was fully proven out, which makes the gap between the promise in the headline and the reality on screen worth closing before launch.
GogoScreen produces this from a deployed URL and one line describing the flow to show, returning a narrated MP4 in roughly two minutes with zooms on clicks, cursor smoothing, dead air removed, and captions burned in. For an app gated by Firebase Authentication, a demo account can be supplied, encrypted, used for a single render, then deleted. When a storyboard is planned first, the credentials are kept encrypted for that session and deleted at most two hours after their last use. None of that changes the actual constraint here, which is editorial: the video has seconds, not minutes, to do its work.
