code: def _upload(name: str, prefix: str, obj: Any) -> Optional[str]:
      from lightning.app.storage.path import (
          _filesystem,
          _is_s3fs_available,
          _shared_storage_path,
      )
  
      name = name.replace(" ", "_")
      filepath = f"{prefix}/{name}.py"
      fs = _filesystem()
  
      if _is_s3fs_available():
          from s3fs import S3FileSystem
  
          if not isinstance(fs, S3FileSystem):
              return None
  
          source_file = str(inspect.getfile(obj.__class__))
          remote_url = str(
              _shared_storage_path() / "artifacts" / filepath
          )
          fs.put(source_file, remote_url)
          return filepath
      return None
  
imports: import errno
  import inspect
  import os
  import os.path
  import shutil
  import sys
  import traceback
  from dataclasses import asdict
  from getpass import getuser
  from importlib.util import module_from_spec, spec_from_file_location
  from tempfile import gettempdir
  from typing import Any, Callable, Dict, List, Optional, Union
  import requests
  from fastapi import HTTPException
  from pydantic import BaseModel
  from lightning.app.api.http_methods import Post
  from lightning.app.api.request_types import _APIRequest, _CommandRequest, _RequestResponse
  from lightning.app.utilities import frontend
  from lightning.app.utilities.app_helpers import Logger, is_overridden
  from lightning.app.utilities.cloud import _get_project
  from lightning.app.utilities.network import LightningClient
  from lightning.app.utilities.state import AppState
label_desc: Use image node_id 5 for calling a global function with example usage: _upload(name, prefix, obj) and returns: None, filepath, None