itch.io

You select a track, then click on the cog at the bottom right, then click on the list button under "Quality" then you select the quality and click on the "share" button. You should be able to save the raw video under  your web browser.

Yes, that's something I'd like to have at one point. I'm open to contributions on this matter: https://github.com/omega-gg/MotionBox