channel feature and keep audio track

bot.py

@@ -5,6 +5,7 @@ import aiohttp
 import asyncio
 import warnings
 import pytz
+import inspect
 
 try:
     req = urllib.request.urlopen("https://google.com", timeout=3)
@@ -41,15 +42,25 @@ else:
 class Bot(Client):
 
     def __init__(self):
+        # max_concurrent_transmissions exists in newer Pyrogram builds but is
+        # missing from some deployed/forked versions. Keep startup compatible.
+        try:
+            transmission_options = (
+                {"max_concurrent_transmissions": 4}
+                if "max_concurrent_transmissions" in inspect.signature(Client.__init__).parameters
+                else {}
+            )
+        except (TypeError, ValueError):
+            transmission_options = {}
         super().__init__(
             name="codeflixbots",
             api_id=Config.API_ID,
             api_hash=Config.API_HASH,
             bot_token=Config.BOT_TOKEN,
             workers=20,
-            max_concurrent_transmissions=4,
             plugins={"root": "plugins"},
             sleep_threshold=15,
+            **transmission_options,
         )
         self.start_time = time.time()