Under the story, users can see a small flash icon to show who has taken a screenshot. The test users are now receiving a pop-up that warns them that the next time they take a screenshot of a person's story the person will be made aware of it. This new feature - the latest to be lifted from Snapchat - hasn't been turned on for all users in order for Instagram to first gauge response.
If this feature is launched, then it would align Instagram with Snapchat in terms of how both platforms deal with screenshots. Instagram is likely testing how people respond to the new notices and may decide to never rollout the feature to all users, or perhaps change its behavior. Where a new camera shutter logo present next to anyone, means that the person had taken a screenshot/screenvideo of the story.
Surprisingly, user who have put the original post won't be shown any alert when somebody takes a screenshot.
To know who all have taken the screenshots, the creator can head over to the list of story viewers.
Acknowledging the test, Instagram told the publication that the service is always testing ways to improve user experience on the platform and make it easier to share any moment with people who matter to you. With this feature, users will be able to keep a tab of their stories and save it from being misused. Putting the phone in airplane mode before taking the screenshot may not trigger Instagram's new warning. In fact, it's one of the reasons why the app became so popular, with users enjoying the fact that they know whether or not their images are being saved and kept for purposes other than originally intended.
Alternatively, you can also resort to a dedicated third-party app, like Story Reposter, to pull off the same trick.