All tracks are created when you drag an object, or element into an empty space in the Action Track list from the Viewer window, Asset or Scene browser. The type of track created depends on what you drag.
To create a character Animation track:
A Character Animation track appears, and the character is selected in the track’s Character menu.
To create a Camera animation track:
You can also drag objects onto a track. If the track contains one or multiple objects, you can then choose to either replace or add to them.