"As with all the personal messages you send on WhatsApp, View Once media is protected by end-to-end encryption so WhatsApp cannot see them. They will also be clearly marked with a new 'one-time' icon.
After the media has been viewed, the message will appear as 'opened' to avoid any confusion about what was happening in the chat at the time.
We’re rolling out the feature to everyone starting this week and are looking forward to feedback on this new way to send private and disappearing media," the company said in a blog post.
New feature alert!
— WhatsApp (@WhatsApp) August 3, 2021
You can now send photos and videos that disappear after they’ve been opened via View Once on WhatsApp, giving you more control over your chats privacy! pic.twitter.com/Ig5BWbX1Ow