https://wccftech.com/ios-13-4-5-allows-sharing-apple-music-to-instagram-stories/

Apple released iOS 13.4.5 beta yesterday for iPhone, iPad and iPod touch. Although it does not have many noticeable new features, users have found that it allows sharing Apple Music to Instagram and Facebook Stories. This works similarly to how Spotify and Netflix support sharing content previews in Instagram Stories, with a link back to the app so that other users can also discover the content.

Instagram Stories is one of the most popular sharing formats on social media right now. It has even left Snapchat behind, the original inventor of the vertical story format. A feature that Instagram actually rolled out before Snapchat was allowing other apps to post to Stories. The Stories contain a link to the content that is in the story, allowing other users to tap through and enjoy it as well.