Whatsapp has received anew update for Android. The latest update brings quick-replies & PDF from Google Drive /OneDrive support.
WhatsApp Changelog:
• When attaching a PDF, you can now tap “Browse other docs…” to pick a PDF from another source, like Google Drive or Microsoft OneDrive (Android 4.4+).
Now, there’s an expandable notification which lets you reply without leaving an app if you want to reply to a Whatsapp message.