UploadiFve OnCancel event - which variable returns the file_id selected?

Question

I am using UploadiFive v1.1.2.

I use the onCancel event to detect a file that has been cancelled in the queue. Is there a returned value to tell me which file was chosen?

I currently use file.name which is not ideal as per below.

'onCancel': function(file) {
    $('#id_' + file.name.slice(0,-4)).remove();
}