Upload file with parameters in Silex with Angular-File-Upload

I'm doing a job with Angular (version 1.5.8) and using Silex as Web Service. To send the file to the Web Service I am using Angular-File-Upload (version 1.5.1), and my Angular service is like this:

self.salvarAnexo = function (id, descricao, anexo) {
    var deferred = $q.defer();
    var url = "http://127.0.0.1:8080/salvar-anexo";

    $upload.upload({
        url: url,
        data: {
            id: id,
            descricao: descricao,
        },

        file: anexo
    }).then(function (response) {

        deferred.resolve(response);

    }, function (error) {
        deferred.reject(error);
    });

    return deferred.promise;
};

And the Web Service looks like this:

    $this->controllers->post('/salvar-anexo', function (Application $app, Request $request) {

        $file = $request->files->get('file');

        if($file){
            $file->move(__DIR__ . '/../../../temp', $file->getClientOriginalName());
        }

        //$params = $request->request->all();

        var_dump($request->files);
        exit;

I usually get the file, I can move it to the location I need, but the parameters I'm sending in the data object I can not get in my Web Service.

Could anyone help me ??? Vlw Galera.