Multicam audio not working
FCPX 10.6.3
I'm new to multicam and I'm 9 scenes into a 10-scene play with 3 camera angles. I've been editing one scene at a time. All of a sudden, on scene 9, when I go to multicam, no audio. (To prep for scene 9, I added 3 additional videos for 6 angles total.) In Editor mode, all the audio is there, no problems. But in Multicam, the audio track is not shown below the clip. I've clicked on "audio roles" about 5 different places and all it says is "edit roles". If I click on video roles, it gives me options. What's going on?
Note the lack of the audio button in the inspector:
Again, only edit. Also, no audio below the clip.
Monitoring Angle set for video and audio:
MacBook Pro (2021)