From the Google Blog:
"Google Drive makes it easy to store and share files in the cloud so you can collaborate securely with your teams and clients while on the go. And we understand that teams work with all kinds of files and tools to get things done. Starting today, we're making it possible to comment directly on more file types including Microsoft Office files, PDFs and images—without having to convert them into Docs, Sheets or Slides." Read more details at the post linked above.
