Quicktime Player > Export Audio Greyed Out
I used Quicktime Player to record video as a .mov. Looking at the file size, I realize I'd rather just keep the audio content. I open the file in quicktime, navigate to File > Export As, and my options are 4k, 1080p, 720p, 480p, and Audio Only. Audio Only is grayed out, and cannot be selected. Is there something I am missing?
MacBook Pro (15-inch, 2017), macOS High Sierra (10.13.6)