'Telegram bot with node.js: how can I sequentially handle all received photos?

I'm developing bot with node-telegram-bot-api and sequelize. It must poll users and create a questionnaire with all results. But when I ask users for photos I receive many messages with photos at one time (photos are in the same media group).

  bot.on("photo", async msg => {
    await photoHandler(msg);
  });

Many photoHandlers work in parallel, not sequentially. How can I handle photos one by one and do action after the last message with photo (in the same mediaGroup)?

node.jstelegramtelegram-botnode-telegram-bot-api


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