code: def zip_files(files):
      with ZipFile("tmp.zip", "w") as zipObj:
          for idx, file in enumerate(files):
              zipObj.write(file.name, file.name.split("/")[-1])
      return "tmp.zip"
  
label_desc: Use image node_id 1 for calling a global function with example usage: zip_files(files) and returns: str