How to partially download a telegram file in with pyrogram

Question

Actually I need to download first few chunks of a file(video/audio/etc) for the sake of mediainfo.

pyrogram:
https://docs.pyrogram.org/api/methods/stop_transmission
https://docs.pyrogram.org/api/bound-methods/Message.download

progress fn (stops transmission when 1% of file has been downloaded)

    def prog(curr, total, client):
      print(curr * 100 / total, '%', flush=True)
      if curr * 100 / total >= 1:
        client.stop_transmission()

implementation

    tmp = msg.download(progress=prog, in_memory=True, progress_args=(client,))
    print(type(tmp), flush=True)
    with open(f'{msg.id}', 'wb') as f:
        f.write(tmp.getvalue())

What output I am getting is:

1.8244671728371091 %
<class 'NoneType'>

here