[Python] how to use FastTelethonhelper properly in an existing code?

I am trying to implement fast_download in my existing code. The problem is fast_download module uses await which I am not familiar with. The official documentation is not enough to implement for my current knowledge. Is there anyone who can help me?

here is my code.

from telethon.sync import TelegramClient
from telethon.tl.functions.messages import GetDialogsRequest
from telethon.tl.functions.channels import GetFullChannelRequest
from FastTelethonhelper import fast_download
from telethon.tl.types import InputPeerEmpty
from tqdm import tqdm

api_id =
api_hash = ''


def callback(current, total):
global pbar
global prev_curr
pbar.update(current - prev_curr)
prev_curr = current


def download_media(group, cl, name):
global pbar
global prev_curr

messages = cl.get_messages(group, limit=2000)

start = 0
print(start)
for i, message in enumerate(messages[start:]):
prev_curr = 0
if message.video:
print("\n{} / {} : {}".format(i + start, len(messages), message.file.name))
pbar = tqdm(total=message.document.size, unit='B', unit_scale=True)
message.download_media('./' + name + '/', progress_callback=callback)
# fast_download(client, message.video, download_folder = './' + name + '/', progress_bar_function=callback)
pbar.close()


with TelegramClient('name', api_id, api_hash) as client:
result = client(GetDialogsRequest(
offset_date=None,
offset_id=0,
offset_peer=InputPeerEmpty(),
limit=500,
hash=0,
))

title = 'channel_name' # Title for channel
channel = client(GetFullChannelRequest(title))
download_media(channel.full_chat, client, "directory_name")



I was expecting to enhance download speed of telethon api. Download speed of some files are limited to 100 kbs, which is too slow for large files. I have already implemented a code to use with telethon built-in module "download_media".

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