code: def stream_files(files, chunk_size=default_chunk_size):
      
      stream = FileStream(files, chunk_size=chunk_size)
  
      return stream.body(), stream.headers
docs: Gets a buffered generator for streaming files.
  
      Returns a buffered generator which encodes a file or list of files as
      :mimetype:`multipart/form-data` with the corresponding headers.
  
      Parameters
      ----------
      files : str
          The file(s) to stream
      chunk_size : int
          Maximum size of each stream chunk