Mostly, people cannot detect if you screenshot their story. For instance, on Snapchat, while it used to notify users when a screenshot was taken of a snap (not exactly a story but a similar concept), for stories, it doesn't do so in the same way. On other popular platforms like TikTok, if you screenshot a user's story, there is no indication sent to the user. This lack of notification is mainly for user privacy reasons to some extent, as it allows people to save content they find interesting without the creator feeling overly monitored or having their privacy invaded. However, as technology evolves, this could potentially change in the future.
On most platforms, no. For example, on Instagram, when you take a screenshot of someone's story, they are not notified. The same goes for Snapchat in some cases. However, there might be some third - party apps or future updates that could potentially change this, but as of now, in general, people can't see if you screenshot their story.
In general, people cannot see that you've screenshot their story. Take Instagram as an example. Instagram doesn't have a built - in feature to inform the story creator when someone screenshots their story. This is also true for platforms like Facebook stories. So, for the most part, you can screenshot a story without the other person knowing. But it's always a good idea to respect the privacy of others when dealing with their shared content.