https://phys.org/news/2019-01-netflix-instagram-team-easier-binge-watching.html

Once you have updated the Netflix app, you can share movies such as Best Picture nominee "Roma" or TV series such as "Grace and Frankie" from My List or elsewhere in the app.

Once you highlight the selection, tap the Share icon and Instagram Stories will now be among your options (other share options include Facebook Messenger, Twitter and text messages).