code: def run(self, data_service, project_file):
          
          remote_path = project_file.path
          file_dict = data_service.get_file(project_file.id).json()
          file_version_id = file_dict['current_version']['id']
          data_service.create_used_relation(self.activity.id, KindType.file_str, file_version_id)
          self.activity.remote_path_to_file_version_id[remote_path] = file_version_id
docs: Attach a remote file to activity with used relationship.
          :param data_service: DataServiceApi: service used to attach relationship
          :param project_file: ProjectFile: contains details about a file we will attach