If you use the View Once tool, there's bad news, as WhatsApp has uncovered a glitch. Worryingly, that means any pictures you've sent with View Once could still be saved on the recipient's phone.
The "View Once" feature in WhatsApp was actually supposed to make content disappear immediately, similar to Snapchat. But this was not the case due to a bug.
A new vulnerability in WhatsApp's 'view-once' media feature on iOS allowed recipients to bypass the intended ephemerality and view the media indefinitely by accessing it through the app's storage ...