New interactive stickers on web stories: image CTA and emoji reaction bar

We've added new interactive stickers for web stories: emoji reaction bar and image CTA. You can now add these interactions to your web stories.

If you're not familiar with them from app stories:

- Image CTA enables you to represent your own branding by adding your own assets to your stories and making them clickable.

- Emoji reaction bar is a perfect tool for gather instant feedback from your users in a more engaging way. Just collect your users' opinion about anything you'd like.