The signs have been here for months for WhatsApp's support of document sharing, but the feature has just started rolling out to users over the past several hours. It doesn't seem like the option is baked into a specific version of WhatsApp since we've seen users from 2.12.453 (official Play Store release) to the latest 2.12.493 (beta) reporting it suddenly becoming available to them, while others still don't have it. Odds are it's a server-side trigger that's spreading the feature, and at a very fast pace according to the tips in our inboxes.
So how does WhatsApp Documents work? Sending a document is a matter of tapping the attachment icon in any chat and choosing the new blue Document icon. There are still 6 options there, but nothing has been removed because Photo and Video have been condensed into one as Camera, which now gives the option to take a new photo or a new video when tapped.
TOP: Old attachment panel. BOTTOM: New attachment panel.
Top: Document picker. Bottom: Attached document.
The new Documents will show up in the media history page of each chat alongside the newly added Links tab, and they're searchable. They'll also be there in the WhatsApp folder on your device's internal storage, under Media / WhatsApp Documents. And finally, you'll be able to toggle the option to automatically download these documents when you're on Wi-Fi, a data connection, or roaming in WhatsApp's settings.
Left: Documents history. Right: Documents in internal storage.
Top: Old contact info screen. Bottom: New design and layout.