mdr-file.js:141 Uncaught ReferenceError: $ is not defined 

mdr-file.js:141 Uncaught ReferenceError: $ is not defined
    at uploadFiles (mdr-file.js:141)
    at m.$scope.upload (mdr-file.js:121)

The demo for this doesnt seem to work. Also, there is no way to get a response from the server or specify a call back.