YUI3 io-upload-iframe

Question

Can you use yui3's io-upload-iframe to send form data along with the file upload? I am setting the form's id, like I normally would to serialize the form data, but since I am setting upload : true, it doesn't seem to pass any form data with the request. Here is the code I am using.

var cfg = {
    method: 'POST',
    form: {
        id: Y.ong('#myform'),
        upload: true
    }
};
var request = Y.io(requestURL, cfg);