IKIQ

@bot.message_handler(regexp="Зашифровать")
def send_text(message):
    msg = bot.send_message(message.chat.id, 'Пришлите файл для зашифровки')
    bot.register_next_step_handler(msg, handle_file)

def handle_file(message):
    try:
        file_info = bot.get_file(message.document.file_id)
        downloaded_file = bot.download_file(file_info.file_path)
        src = 'D:' + message.document.file_name;
        filename = message.document.file_name
        return filename
        with open(src, 'wb') as new_file:
            new_file.write(downloaded_file)
            bot.reply_to(message, "Шифрую...")
    except Exception as e:
        bot.reply_to(message, e)