Sorry, you can't. There's no standard or common method to be aware when someone screenshots your story. It's something that happens without your immediate knowledge.
In most cases, no. There's usually no direct way to know if someone screenshots your story.
Generally, it's hard to tell. Most platforms don't have a built-in feature to notify you when someone takes a screenshot of your story. However, some third-party apps claim to offer this functionality, but their reliability can be questionable.