Exporting
The export formats, video exports, and which edit is exported.
Formats
Export a project as WAV, FLAC, MP3, M4A or Opus. WAV and FLAC keep every sample they were given, so a cut of a lossless master stays lossless.
A project with a video take in it can also be exported as MP4, with the picture and the sound cut at the same words. A take recorded as audio plays as black in that export, with its sound.
Video uploaded from your browser
If the picture of a video is still on your computer, an MP4 export uploads it first. The tab that added the video sends it on its own; from any other tab you are asked to choose the same file again.
Which edit is exported
The export is cut from the edit the server holds, so it waits for your latest change to be saved before it starts. Exporting again after another edit costs nothing.