How to Send Large Files in Telegram

import os
import math
from telegram import Bot
from telegram.ext import Application, CommandHandler

async def split_and_send_file(update, context):
    file_path = context.args[0] if context.args else None
    
    if not file_path or not os.path.exists(file_path):
        await update.message.reply_text("File not found!")
        return
    
    # Get file size and calculate parts
    file_size = os.path.getsize(file_path)
    chunk_size = 1800 * 1024 * 1024  # 1.8GB chunks
    total_parts = math.ceil(file_size / chunk_size)
    
    await update.message.reply_text(f"Splitting {file_path} into {total_parts} parts...")
    
    with open(file_path, 'rb') as f:
        for i in range(total_parts):
            chunk = f.read(chunk_size)
            part_name = f"{file_path}.part{i+1:03d}"
            
            with open(part_name, 'wb') as part_file:
                part_file.write(chunk)
            
            # Send each part
            await context.bot.send_document(
                chat_id=update.effective_chat.id,
                document=open(part_name, 'rb'),
                caption=f"Part {i+1}/{total_parts}"
            )
            
            os.remove(part_name)  # Clean up
    
                        await update.message.reply_text("✅ All parts sent successfully!")

# Application setup
app = Application.builder().token("YOUR_BOT_TOKEN").build()
app.add_handler(CommandHandler("split_file", split_and_send_file))
app.run_polling()