P3D v4 Camera definitions in cfg and scenario files

There are camera definitions defined in both cameras.cfg and the scenario fxml files. To create a new camera such as a tower view at a defined lat/long/alt position intended to be used only during a particular scenario, would it require defining in cameras.cfg as well or independently in the particular scenario files only?
For regular sim use, from what I understand last night just the cameras.cfg, if it's for a scenario then FXML (which will only show up in the scenario not the regular sim)