Since there is no option on Instagram for saving photos and videos, users take screenshot of the photos or screen record of the videos to keep them in their phone's gallery. Also, some users want to keep their conversations with specific users and take screenshots of their whole conversation.
So, you might have asked yourself that "Does Instagram notify the user about my screenshot?"
Now, you can get the answer about taking screenshot of the Instagram's comment, live, direct message, etc.
https://instazood.com/blog/how-does-instagram-screenshot-notification-work/
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