code: def item(proto_dataset_uri, input_file, relpath_in_dataset):
      
      proto_dataset = dtoolcore.ProtoDataSet.from_uri(
          proto_dataset_uri,
          config_path=CONFIG_PATH)
      if relpath_in_dataset == "":
          relpath_in_dataset = os.path.basename(input_file)
      proto_dataset.put_item(input_file, relpath_in_dataset)
docs: Add a file to the proto dataset.