Using multiple queues in the same input element with angular-file-upload

I'm using nervgh/angular-file-upload to upload multiple files on my app. The requirement is that there are multiple Questions added by the user, each with its own FileUploader on the interface.

When I write multiple inputs as a proof of concept, it works - but this is not a good solution since the user can add as many questions as it wants.

I'm trying to use the same input object and change it's attributes dynamically so the file is sent to the proper question:

HTML

<div ng-app="app">
  <div ng-controller="AppController">
    <h2>{{question.title}}</h2>
      <input type="file" nv-file-select uploader="question.uploader"/><br/>
      <ul>
          <li ng-repeat="item in question.uploader.queue">
            <span ng-bind="item.file.name"></span><br/>
          </li>
      </ul>
    <button ng-click="next()">next question</button>
  </div>
</div>

JS

var app = angular.module('app', ['angularFileUpload']);
app.controller('AppController', function($scope, FileUploader) {
  $scope.questions = [{title: 'q1'}, {title: 'q2'}];
  $scope.questions.forEach(function(item){
    item.uploader = new FileUploader();
  });
  $scope.question = $scope.questions[0];
  $scope.next = function(){
    var curIndex = $scope.questions.indexOf($scope.question);
    var next = curIndex + 1 >= $scope.questions.length 
                ? 0 
                : curIndex + 1;
    $scope.question = $scope.questions[next];
  };
});

FIDDLE HERE

When doing this, every time a file is added to q2 on the UI it shows up on queue q1. It seems that the uploader attribute of the input is not being updated, or (if it is) is being ignored.

Is there a way to upload a file to the proper queue with only one input element?