From selfies to Boomerangs, now you can be even more fun and playful when you respond to friends. To reply with a photo or a video, tap the new camera button while you’re watching a story. You can use any creative tools in the camera, including face filters, stickers and Rewind. Replies also include a sticker of the story that you can move around and resize.
When a friend replies to your story, you'll see the reply in your inbox. You can tap to view it and a sticker of the original story that's only visible to you. Your friends will be notified if you take a screen or replay a reply.
The update is available in Instagram version 10.28 and above. You can download Instagram from the App Store for free.