Start a new project by selecting your main video. To add your second video, tap the “Overlay” tool on the bottom menu, then “Add overlay,” and choose your secondary video. Resize the window of the overlay video to cover as much of the screen as you’d like.
From there, you can make edits to each clip separately by tapping the one you want to work with. As a first order of business, we recommend adjusting your clips’ length using the sliders.