It’s official!The feature that most of the users were looking to have in WhatsApp is now included in the app. The document sharing feature has now made official in the version 2.12.489 which is currently available from the link below. Currently, its limited to sending only PDFs but we might see other supported documents in near future. All you have to do click on the attachment pin icon and you will see the Documents option.
PS: This feature is currently only for Android users.