Flattening Multicam

Despite asking for the ability to flatten multicam on every version of FCPX since it had multicam we still don't have it.

I have a 4 part series that's full of multicam and some of the shots need some tweaking here and there with effects that don't work with multicam clips, e.g. stabilisation, TrackX etc.

What have you found to be the quickest, most reliable, most stable, least destructive method of flattening the multicam clips?

Missing media— I re made one section of multicam clip. then I had to double click to separate to sync up a couple frames. Now I can’t get the multicam clip back together. Kinda like Humpty Dumpty. How do you do that? Please don't say xml through Resolve.

Don't understand what you mean by get it back together again? You opened it from the project, adjusted it, now you need to go back to the project.