code: def upload(self, *args, **kwargs):
          
  
          return self._resource.attachments.upload(self['sys_id'], *args, **kwargs)
docs: Convenience method for attaching files to a fetched record
  
          :param args: args to pass along to `Attachment.upload`
          :param kwargs: kwargs to pass along to `Attachment.upload`
          :return: upload response object