These files are end-to-end encrypted, which means that not even WhatsApp will be able to see the image. Once the person has viewed the video or photo, it will be marked as “open”. The feature will be available worldwide this week
It will work both for photos that you take directly from the WhatsApp camera and for those that you have saved on your cell phone.
How do I send photos that disappear ?
In the bar where you can write a comment about the photo you are going to send, a symbol of a “1” will appear inside a circle. By clicking on that symbol, you are sending a file that can only be viewed once.