Как узнать, что отправлен последний файл медиагруппы в Телеграм?

Foldren, спасибо. Решил адаптировать под middelware

import asyncio
from typing import *
from aiogram import BaseMiddleware
from aiogram.exceptions import TelegramBadRequest
from aiogram.types import Message, CallbackQuery

class MediaMiddleware(BaseMiddleware):
    def __init__(self, latency: Union[int, float] = 0.6):
        self.medias = {}
        self.latency = latency
        super(MediaMiddleware, self).__init__()


    async def __call__(
        self,
        handler: Callable[[Union[Message, CallbackQuery], Dict[str, Any]], Awaitable[Any]],
        event: Union[Message, CallbackQuery],
        data: Dict[str, Any]
    ) -> Any:

        if isinstance(event, Message) and event.media_group_id:
            try:
                self.medias[event.media_group_id].append(event)

                last_message_flag = False
                try:
                    await event.bot.edit_message_text(
                        text="  ",
                        chat_id=event.from_user.id,
                        message_id=event.message_id + 1
                    )
                except TelegramBadRequest as exc:
                    if (exc.message == "Bad Request: message must be non-empty" or
                            exc.message == "Bad Request: message to edit not found"):
                        last_message_flag = True

                if last_message_flag:
                    data["media_events"] = self.medias.pop(event.media_group_id)
                    return await handler(event, data)

                return

            except KeyError:
                self.medias[event.media_group_id] = [event]
                return

        return await handler(event, data)