Following the opening of self-destructing messages, WhatsApp’s “only watch once” feature is now also availablePictures and videosNS. After clicking this option, the content sent by the user will disappear after the other party has viewed it once. And it doesn’t have a preview, and recipients can’t download it on their own devices. However, it should be noted that at least the current WhatsApp app does not send a corresponding reminder to the sender when the recipient saves the “only watch once” content through screenshots or screen recording. At this point, Snapchat and other software are undoubtedly better, and the WhatsApp team would better follow up on this in the future.