AngularJS upload files to server

I try to upload image to server, but have some troubles...

i have such html:

<form role="form" enctype="multipart/form-data">
    <input type="file" class="form-control" id="photo" ng-model="news.Photo" placeholder="Link" />
    <button ng-click="addImage()" class="btn btn-primary">Add</button>
</form>

and such code in .js:

$scope.addImage = function(){
  $http.post(settings.apiBaseUri + "/files", $scope.news.Photo, 
    {headers: {'Content-Type': 'multipart/form-data'}})
    .success(function (response) {
      $scope.clearEvent();
    })
    .error(function (err, status) {
      console.log('operation failed, status: ' + status);
    });
};

what i do wrong? maybe it's not server problem, but my, maybe i write something bad?