You can snap a screenshot of someone’s Instagram photo, message, or status update without them knowing it. However, there is one DM-related scenario in which users will actually get a snapshot alert.
Does Instagram Send Notifications for Screenshots of Photo or Video Posts?
The answer is no. Instagram posts that appear in your main feed, on user profiles, or when you visit the Explore tab will not trigger screenshot alerts. The same holds true for screen captures made while another user’s video is playing, should you want to do so.
Does Instagram Send Notifications for Screenshots of Stories?

The answer is no. Instagram did test a way for users to see when someone took a screenshot of their stories, but that option has since been removed. In February 2018, the peculiarity was first observed. It disappeared by June. Since then, anyone on Instagram can take a snapshot of someone else’s story without their knowledge.
Does Instagram Send Notifications for Screenshots of Direct Messages?
In some instances, it does serve as a warning. Take a picture or record a short video with the Instagram app’s camera, then send it as a private message through Instagram Direct to anybody you want to see it before it disappears forever.
According to Instagram’s Help Center, if any of your receivers snap a screenshot of it, you will receive a notification. Anything else you write in a direct message won’t be seen. Direct message screenshots of non-disappearing content (such as feed posts, text, or hashtags) will not trigger a notification.
Does Instagram Send Notifications for Screenshots of User Profiles?

The answer is no. It’s completely undetectable if you take a screenshot of someone else’s profile. This could be useful if you only want to store their bio link or contact info without really following them. Apps that claim to alert you when someone takes a screenshot on Instagram should be avoided at all costs.
Beware of Third-Party Apps That Claim to Notify You of Instagram Screenshots
Any third-party software that promises to alert you with a screenshot is either hopelessly out-of-date or a complete hoax. Because of Instagram’s security and privacy concerns, no app you install will be able to successfully notify you who is taking screenshots of your post.
Avoid downloading any program that promises to reveal who is capturing screenshots of your stuff. You risk having your Instagram account compromised or your device infected with malware if you download a rogue app.
