Carousels are now an eligible media type on the Instagram Graph API, giving third-party developers the ability to empower businesses to publish carousel style media to Instagram for the first time. This will give more businesses broader access to a feature that has become an integral part of the Instagram experience for people, businesses, publishers and creators.
This API enhancement will be available for the current version, v13.0, and all previous versions of the Graph API. As there are no new endpoints or permissions, carousels will become automatically available for developers who already have access to the Content Publishing API.
These developers will not need to put their apps through additional App Review, as long as their apps have already been approved for the appropriate permission access levels.
Please view the developer documentation for additional information.