WhatsApp has been adding new features such as adding "Forwarded" label to the forwarded messages, recording longer voice messages without holding the icon, group voice and group video calling feature since they introduced it in F8 and is trying to level-up the game.
With latest update for the beta program, beta testers observed that WhatsApp added a new feature silently to test it with beta. The new feature is called "Media Visibility" which allows you to hide received media from a particular chat and for a particular chat. That means you can hide photos, videos and audios for a particular chat which means it won't be displayed in your phone's gallery.
Media Visibility feature can be accessed by opening a contact’s page on
WhatsApp. Here, you’ll find the feature and by tapping on it a new
window opens up which lets you choose between "Yes" or "No"
for showing the downloaded media in the gallery. You can also set your
choice to "Default" which is the setting that applies to all the chats.
The “Default” has been preset to Yes, which means that unless you
select "No" for a specific contact, media will be visible in the
gallery. To change the default setting, you can head
over to Settings and then tap on "Chats" where you can check or uncheck
the checkbox beside Media Visibility option.
NOTE: This feature is currently limited to beta.