Creating Multicam Video When Each Camera Split The Video

That’s all completely wrong. If you assign camera angles to the shots from each camera in the inspector to the clips in the browser, when you create the multicam clip the shots will be assigned to the correct lane in the multicam clip. It’s really simple. Everything is done with the multicam clip before it’s put in the project. You don’t have to do anything in the timeline. Creating the multicam clip does it all.

Read through the Multicam section of the user manual. It will explain very clearly the multicam workflow and make your work way easier. I promise.

Intro to multicam editing in Final Cut Pro for Mac - Apple Support

There is no need to force multicam or composite clips. Place the clip you want to use on the timeline. You can freely combine which images and sounds to use.

By looking at the sound waveforms between clips, you can immediately determine which time period the clip is from.

There is no problem at all with having multiple clips per camera. Just make sure to assign the same camera angle to clips from the same camera, then select all the clips from both cameras and create the multicam.

If you assign the angle name then the clips from the same camera will be in the same angle. You will get a multicam clip with two angles, just as if each camera had recorded one single clip, no problem.