Is it possible to change multicam angle property? Or add video to what is seen as a audio angle?

Question

I'm getting footage from overseas and first I was sent just the audio files, so I assumed i could just put the audio files into a multicam clip angle and started keywording and favoriting the new clip, which i did.  Now I've received the video files.  as per normal, I added an angle from the triangle drop-down menu, and tried adding the video but it won't let me.  Using an "insert edit" I get a message "You are combining audio and video clips in an audio-only angle. You cannot add video clips to existing audio-only angles." 
The issue seems to be that if the first angle you create only gets audio files added to it, and you then use that angle to add another angle from the triangle drop-down, it forces that new angle to be audio only, and it won't accept video. I've confirmed this with separate tests.
I could start the multicam clip from scratch and add a video clip first, but trying not to lose all the keywording work (which was a lot).  There doesn't seem to be any way to change angle properties or to add a new angle that isn't audio-only by default.
any suggestions much appreciated

Answer 1

Just click on the little triangle in the Angle Editor and choose "Add Angle". Now drag your video clip into the new angle.
Synchronization, though, is another matter. All in all, you'll probably be better served by creating a new mulicam clip, by way of which you'll get everything properly synched.