Some have spotted a server-side switch that enables you to share PDFs (the only supported file type for now) to another contact.
When you touch the paperclip button you’ll see an option to send a document, along with buttons for Camera, Gallery, Audio, Location, and Contact.
However, if the recipient doesn’t have the update, you won’t be able to send anything (see below).
This is one of those staggered rollouts, so you may just need some patience if it hasn’t hit you yet. You can always join the Play Store beta program or grab the latest beta file from APK Mirror in hopes of speeding things along.
The story behind the story: Messaging is growing beyond just the exchange of text and pictures. Facebook’s Messenger, for example, has grandiose plans to turn the service into a shopping platform. Give how much time people spend messaging, expect for companies to find more ways to keep you in the conversation.