"You can truly get stuff done from any device — your iPhone, iPad, Android phone, Android tablet, laptop or desktop computer. Any change you make on any of these devices is saved automatically, so you can pick up right where you left off any time, anywhere that you can sign in. The Docs, Sheets and Slides apps come with offline editing built right in. Just make the files you want to edit available offline. Any changes you make offline get automatically synced when you reconnect, just like when you make offline edits from your computer. And while converting Office files to Docs, Sheets and Slides is a cinch, the new iPhone/iPad apps also let you edit Office files directly - just like on the Android apps and the web," informs Google.
Native Office editing using the Office Compatibility Mode is a great feature and now Google's productivity apps for iOS are more powerful and can better compete with Microsoft Office.