OBS Studio multitrack audio exports only one track I have OBS Studio configured to combine different audio inputs into several audio tracks/channels using its built-in mixer. But when OBS saves a local copy of the stream, the video file only has one audio track, not the several I configured. I'm exporting the video to MKV file, as I thought it would be the most versatile format and had support for multiple audio/video tracks.

Is this a configuration issue or is there something else to keep in mind? Perhaps a different export file format would be better? I'd still like to retain all (multiple) audio tracks within the single exported file.
In OBS Studio go to Settigns->Output->Recording and under Recording Format you have Audio Track. You have to enable audio tracks that you set up in audio mixer. You can also name them in Audio tab.