It enables photos and videos to be deleted after opening.
However, these View Once attachments can be backed up and restored so long as the message is unopened.
You wont be notified if something like this happens, unlike in Snapchat.
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This is the latest feature rolled out by WhatsApp to give ever-increasing control to users.
Users also have the option to enabledisappearing messages.
These sent messages will disappear after a week.
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