As of now, Instagram doesn't give any indication to the story creator that someone has screenshot their story. This is different from some other features on Instagram like direct messages where you can see if someone has taken a screenshot of a disappearing photo or video. But for IG stories, it's private and the act of screenshotting remains unnoticed by the story's owner.
Well, by default, Instagram doesn't have a feature that alerts users when their stories are screenshot. However, there are some third - party apps that claim to be able to detect screenshots, but these are not official Instagram features and often come with risks like violating Instagram's terms of use or being unreliable. So, for the most part, regular Instagram users won't know if you've screenshot their stories.
No, Instagram doesn't notify the person who posted the story if you take a screenshot of it. So you can screenshot their Ig story without them knowing.
Yes, Instagram notifies the user when someone takes a screenshot of their story. However, this only applies to normal stories. For some disappearing or private stories, the rules might be a bit different.