Keynote "record" greyed out
I'm trying to record a VoiceOver narration on my Mac in Keynote. Under the Audio tab, the record button is greyed out. If I try to select "record presentation" from the Play menu, it is also greyed out. I can select "media" and record an audio file, but that is only for the slide I'm on and it doesn't advance through the slide deck. What am I doing wrong?