I think I got you... You try to push selected file names in an array...
The problem is that the rendering of Kendo UI is different from browser to browser, so you have to use Kendo UI API for the specific control (Uploader in our case) and not try to access it using plain JavaScript!
http://docs.telerik.com/kendo-ui/api/web/upload[
^]
$("#files").kendoUpload({
upload: onUpload
});
function onUpload(e) {
var files = e.files;
$.each(files, function () {
});
}