How do I load a multi-page form in AngularJS?

Form type:

        <form enctype="multipart/form-data" ng-submit="upload(file)">

            <input type="file" ng-model="modal.file" accept="image/gif" app-filereader /><br />

            <br>

            <textarea name="description" placeholder="Description" ng-model="description" id="" cols="30" rows="10"></textarea>

            <br>

            <input type="hidden" name="user" ng-model="user" value="{{ user }}" />

            <br>

            <input type="submit" value="Submit" class="network-sensitive button button-block button" />

        </form>

      

        
        
        
      

    

Directive

.directive('appFilereader', function(
$q
){
    var slice = Array.prototype.slice;

return {
    restrict: 'A'
    , require: '?ngModel'
    , link: function(scope, element, attrs, ngModel){
        if(!ngModel) return;

        ngModel.$render = function(){}

        element.bind('change', function(e){
            var element = e.target;

            $q.all(slice.call(element.files, 0).map(readFile))
            .then(function(values){
                if(element.multiple) ngModel.$setViewValue(values);
                else ngModel.$setViewValue(values.length ? values[0] : null);
            });

            function readFile(file) {
                var deferred = $q.defer();

                var reader = new FileReader()
                reader.onload = function(e){
                    deferred.resolve(e.target.result);
                }
                reader.onerror = function(e) {
                    deferred.reject(e);
                }
                reader.readAsDataURL(file);

                return deferred.promise;
            }

        });

    }

};

});

      

        
        
        
      

    

Download function in my services:

upload: function(file) {
  var token = $window.sessionStorage.token;

  var url = 'http://url.co/api/posts/creates';

  var $cache = $cacheFactory.get('$http');

  var deffered = $q.defer();

  var data = $cache.get(url);

  if(!data) {
      $http({
        url: url, 
        method: "POST",
        params: { access_token: token },
        data: file,
        headers: {'Content-Type': undefined },
        transformRequest: angular.identity
      }).then(function(res) {
      deffered.resolve(res);
    });
  } else {
    deffered.resolve(data);
  }

  return deffered.promise;
  }

      

        
        
        
      

    

I didn't include the controller code as it was just passing the form data from the modal service and the part that works.

The problem I am facing is that the file is being transferred as encoded data (my knowledge is a little shaky about binary data and blocks, etc.). And my API (written in Symfony2) expects a normal file feed as opposed to a data string.

So how would I convert this binary block into an image file that I can send? Or am I missing something?