How to Record Audio to go over a video recorded in Articulate Storyline 2

I have recorded the PowerPoint slides I want in my course, which I have designated Video. Now, I want record the audio to go over it also in Articulate. At first, I tried to record the audio and video at the same time. Only the video recorded. Now, when I attempt to record to the microphone (selecting Insert > Options >Audio > Record Mic...  I get the Record Microphone dialog, yes. But, when I click the red Record button, I see "Start recording in 2 seconds," but it freezes on the "Start recording in 1 seconds" display.

 

What's going on and how can I get my audio to record over the video I've already recorded in Articulate Storyline 2?

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