While a project can have only one video in it, any number of audio tracks can be recorded either before or after a video. To record additional tracks or a video, open the project top "record" in the top left. Then swipe left to enter "video” record mode and tap the large red record button to begin. For audio, just stay on the main record screen and tap the record button.
Projects will be automatically trimmed to the length of the video.
If you delete the video after saving, the audio will be restored to the full length of the longest track and you can record another video take in the same project.
We recommend using AirPods or wired headphones when doing multi track recording. Other Bluetooth devices make work but are not fully supported and may create a delay due to the latency of the wireless connection.