Añadir varios plugins a ckeditor

hola a todos de nuevo! estoy pegandome con ckeditor, quiero poner otro plugin que es el de subir imagenes, e bajado varios, pero no consigo que se vean, no se si sera el plugin correcto o no... o estoy instalandolo mal....

estoy usando este uploadfile

y a la hora de configurar, en config.js
lo pongo asi

CKEDITOR.editorConfig = function( config ) {    
config.extraPlugins = 'insertpre','uploadfile','link' ;
	// Define changes to default configuration here.
	// For complete reference see:
	// http://docs.ckeditor.com/#!/api/CKEDITOR.config

    config.uiColor = '#fafafa';
	config.entities_latin = false;
	config.disableNativeSpellChecker = false;
	config.enterMode = CKEDITOR.ENTER_BR;
	config.language = 'es';



	// The toolbar groups arrangement, optimized for a single toolbar row.
	config.toolbarGroups = [
		{ name: 'document',	   groups: [ 'mode', 'document', 'doctools' ] },
		{ name: 'clipboard',   groups: [ 'clipboard', 'undo' ] },
		{ name: 'editing',     groups: [ 'find', 'selection', 'spellchecker' ] },
		{ name: 'forms' },
		{ name: 'basicstyles', groups: [ 'basicstyles', 'cleanup' ] },
		{ name: 'paragraph',   groups: [ 'list', 'indent', 'blocks', 'align', 'bidi' ] },
		{ name: 'links' },
		{ name: 'insert' },
		{ name: 'styles' },
		{ name: 'colors' },
		{ name: 'tools' },
		{ name: 'others' },
		{ name: 'about' }
	];
	

	// The default plugins included in the basic setup define some buttons that
	// are not needed in a basic editor. They are removed here.
	config.removeButtons = 'Cut,Copy,Paste,Undo,Redo,Anchor,Underline,Strike,Subscript,Superscript';

	// Dialog windows are also simplified.
	config.removeDialogTabs = 'link:advanced';
};

alguna forma de que sea visibles todos?