Expansion files in iOS

The application.

Well, rigth now i am trying to make the application get a sd card folder with the videos with no sucess.

I am trying this way:

var file:File = File.userDirectory.resolvePath("Empordef/");
var XML_URL: String = file.url + "/lista.xml";
var myXMLURL: URLRequest = new URLRequest(XML_URL);
var myLoader: URLLoader = new URLLoader(myXMLURL);

According to this website, this is rigth.

It returns me:

I searched for, and this is the internal storage.

Does it returns me internal storage because i have no permissions to access to sd card?

How do i get the external storage?

Thank you!