code: def upload(self, fp, token=None, target_name=None, content_type=None):
          
          return UploadRequest(self).post(fp, token=token, target_name=target_name, content_type=content_type)
docs: Upload a file to Zendesk.
  
          :param fp: file object, StringIO instance, content, or file path to be
                     uploaded
          :param token: upload token for uploading multiple files
          :param target_name: name of the file inside Zendesk
          :return: :class:`Upload` object containing a token and other information see
              Zendesk API `Reference <https://developer.zendesk.com/rest_api/docs/core/attachments#uploading-files>`__.