How to share a document in iCloud Drive in iOS 11 and macOS High Sierra

With iOS 11 and macOS High Sierra, you’ll be able to invite others to collaborate with you on a document directly in iCloud Drive, and it isn’t restricted to Apple apps!You’ve been able to share and collaborate on iWork documents for a while, but with iOS 11 and macOS High Sierra, you’ll be able to share and collaborate on documents in real time, directly through iCloud Drive. With time, third-party apps will be able to take advantage of iCloud Drive invites, as well.

Credit: 

How to share a document in iCloud Drive in iOS 11 and macOS High Sierra