Why is the iCloud Drive not available for iOS 11?

I just upgraded to the iPhone 8 Plus and the iCloud Drive is not available. Why is it not available for iOS 11? This is a very useful tool and would love to have it on my new phone. Thank you to anyone that can help me with this.

iCloud Drive is available through the new Files app, check it out.

BTW, you should change your online profile info.