In most cases, the answer is no. Consider platforms like Facebook or Instagram. Their main focus is on sharing content widely. If users were notified every time someone took a screenshot of their story, it might discourage sharing. Also, from a technical perspective, implementing such a feature across all devices and scenarios is quite complex. So, generally, people can't tell if you screenshot their story.
Typically, they can't. Whether it's Snapchat (where screenshotting a story used to be more detectable but now has less strict detection in many cases), Instagram, or Facebook, these platforms do not currently provide a built - in way for the story creator to be informed that someone has taken a screenshot of their story. But, always be aware that technology can change, and new features could potentially be added in the future.
Sure. People might do that if they think the screenshot adds value or helps convey the story better. Maybe it's a visually interesting part or something they want to draw your attention to specifically.
It depends. Some social media platforms have built-in mechanisms to notify the creator if a screenshot is taken, but not all do. Also, it can be hard to know for sure if it's done privately without any such alerts.
Typically, no one can tell if you screenshot a story. Unless there's some sort of notification system in place or you accidentally reveal it yourself, it should remain private.