docs: function uploadToUpyun(path, file, __newFile, done) {
    var options = this.options;
    var upyun = getInstance(options);
    upyun.uploadFile(path, file, __newFile.headers['content-type'], true, function (err, data) {
      if (err) {
        return done(err);
      }
      if (!data) {
        return done(new Error('Upload failed!'));
      }
      if (data && data.statusCode != 200) {
        return done(new Error(data.error['message']));
      }
      __newFile.fd = options.domain + path;
      return done();
    });
  }