The feature was first announced by WhatsApp’s parent company Meta in August, along with other privacy features for the app — leaving groups silently and choosing who can see you online.
Finally, WhatsApp is finally releasing this protection to prevent people from taking a screenshot, or a screen recording, to view once messages and it is available for some users that install the latest beta from TestFlight!”
When this feature is enabled for a “View Once” media: Screen capture for later viewing of photos and videos is also by default disabled.
The attempt to take a screenshot is always blocked but it is not notified.

Source - cnbctv18
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