I use Instagram with my business and have it connected to my online store. If I'm posting normally, I can tag shop products so people can tap to shop. I can't schedule posts with shop product tags, as it currently doesn't exist on Later. It would be great to be able to tag products as well as people.
This is not possible via the Instagram API. Any 3rd party apps that offer this are not using the Instagram API, are not Instagram partners, and are most likely violating their terms of service, which ultimately risks your IG account from being banned. We recommend you do not use any such 3rd party apps.
We are rolling out a linkin.bio solution that will allow users to integrate Shopify directly into their linkin.bio posts - and the ability to track back revenue against your individual scheduled posts. Should be launched before 2019