void AddChannel ( const [FMovieSceneChannelHandle](API\Runtime\MovieScene\Channels\FMovieSceneChannelHandle) & Channel, [TFunction](API\Runtime\Core\GenericPlatform\TFunction)< [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [UE::Sequencer::FChannelModel](API\Editor\Sequencer\MVVM\ViewModels\FChannelModel) >([FName](API\Runtime\Core\UObject\FName), const [FMovieSceneChannelHandle](API\Runtime\MovieScene\Channels\FMovieSceneChannelHandle) &)> OptionalFactory )