To send disappearing media files in WhatsApp, you can launch the app on Android or iPhone, and open any conversation. In WhatsApp for iPhone, tap the “+” (plus) button located to the left of the chat box.

In WhatsApp chats on iPhone, select “Camera” or “Photo & Video Library” after hitting the “+” (plus) button in the WhatsApp chat. You can either click or pick the photo or video that you’d like to send.
In WhatsApp for Android, you can open any chat and hit the paper clip icon inside the chat box.
With that done, select “Camera” or “Gallery” and you can either click or select a photo or video to send.

• Once you’ve selected the media file in WhatsApp, you can tap the “1” icon, also known as the View Once button. This button appears in the bottom-right corner of the caption box, to the left of the blue send button.
• Once you tap the View Once button, WhatsApp will show a pop-up informing you that this is a disappearing photo or video. You can dismiss this pop-up by tapping “OK.”
• With the View Once button selected, tap the “Send” button in the bottom-right corner of the screen to send disappearing photos or videos on WhatsApp. The “Send” button is on iPhone a right arrow on a blue circle background and, on Android, a right arrow with a green circle background.
• Once the recipient opens the media file you just sent on WhatsApp, it’ll be automatically deleted from their phone.