I too have same question. Is it possible to wrote to a file from AudioServerPlugin? If Yes, to which disk path we can write?

To summarise: Recorded file will have stereo channels, Left front and rear is recorded in Left channel; Right Front and rear is recorded in right channel. I am not handling mixing explicitly. I wanted to know if AVCaptureAudioDataOutput mixes channels if it receives 6 channels as input and output should be only 2.

The query was already posted and there was a solution for it: https://developer.apple.com/forums/thread/690481

Apple has not addressed the issue even after a week. Bug ID: FB9760173 I am not able to proceed without sandbox receipt as I need to test in-app purchase integration which I introduced for the first time in my app. Is there any work around?

In 10.13 and below it is working fine. Catalina onwards it has issues. In the Console I am getting the following console messages:  ReceiptRefreshRequest: Error fetching receipt for /Applications/MyAppName.app - Error Domain=com.apple.commerce.client Code=500 "(null)" Failed to perform in-line receipt renewal for application at path/Applications/MyAppName.app : 'Error Domain=com.apple.commerce.client Code=500 "(null)