Instagram has confirmed it is testing an option that lets you “regram” public feed posts from other users to your Story, as reported by TechCrunch.
For those who have access to the new feature, it will appear as “Add post to your story” when you tap the share icon underneath a post. If you don’t want your public posts to be shared in this way, there is the option to change your privacy settings. Even if your account doesn’t have the ability to currently reshare, you should still see the option now for “Allow Resharing to Stories” if you go to Settings > Story Settings.
As pointed out by app developer Zachary Shakked on Twitter, when the post is added to your Story, you then have options for how you want it to appear. You can resize it, rotate it, move it around, and there are two options for how it visually looks: one that is a cleaner design with the original user’s handle underneath, and one that appears more like a traditional Instagram post you might see in your feed.