1. Decide which audio you need
Microphone captures narration. Shared audio captures sound offered by the selected Chrome source. Enable either one or both before recording.
2. Grant microphone access
Turn on Microphone. When Chrome asks for permission, choose Allow. If access was denied previously, use the site controls in the address bar or Chrome privacy settings to restore it.
3. Share source audio
Turn on Shared audio and select Start recording. In Chrome's native chooser, enable Share audio when that option appears.
4. Verify the result
After stopping, play a short section in the editor. Configuration lets you adjust the original audio level, but audio that was never captured cannot be reconstructed.