code: def load_merge_candidate(self, filename=None, config=None):
          
          self.config_replace = False
          return_status, msg = self._load_candidate_wrapper(source_file=filename,
                                                            source_config=config,
                                                            dest_file=self.merge_cfg,
                                                            file_system=self.dest_file_system)
          if not return_status:
              raise MergeConfigException(msg)
docs: SCP file to remote device.
  
          Merge configuration in: copy <file> running-config