Troubleshooting the Basics of Telling Mono and Stereo Audio Apart
https://video-workflow-guide.ironwoodscope.com/posts/common-browser-download-issues-and-easy-checks
Troubleshooting the Basics of Telling Mono and Stereo Audio Apart Small errors can begin with an ordinary case: a speech plays from one channel. Even a file that opens may not be the item you expected