Flagging orders with products from a specific vendor

I am using a dropship vendor that I have to manually pay for the fulfilment service after the customer makes their purchase. I would like to flag all orders that have products from this vendor so that I don’t miss going in to make the payment. Since there is a tags column on the order page in Shopify, I am hoping there is a way to tag all orders that include products from this vendor. Can this be done?

You can do this with an app.

Try Shopify Flow, if that doesn’t work, you can for sure use Order Automator app by creating a rule to match the vendor, then it will auto tag new orders, and you can also bulk process old orders.