I am getting up to speed on video export. The results are nice, except my audio is pretty bad. I am using my phone (Pixel 2) for for main channel, and a GoPro for secondary channel (PiP). This setup makes most sense video wise for me, as I have my phone on the windshield, and my GoPro behind in between seats. My GoPro has an external mic so it can capture much better audio. It would be great if when configuring my RCP export, I could choose audio from channel 2. Am I correct, that audio can only come from the primary video channel at present?