Make sure you have the Instagram app installed on your device. Log into your account.
Open up X for iOS app. Tap the share icon on a public Post.
Note: A protected Post cannot be shared.
Tap the Instagram icon.
Your X for iOS app will close, and a new Story draft on your Instagram app will open.
The Post you want to share will appear as a moveable and resizable sticker to share on Instagram Stories.
You can share the Post with a single person, a group, or all of your followers.