
With yesterday's launch of OS X Yosemite, Apple's iCloud Drive file storage system is now functional across the company's products. Many users were frustrated following the launch of iOS 8 last month by the incompatibility between the new iCloud Drive system used with that operating system and the previous Documents in the Cloud system used on OS X Mavericks. The difference in launch dates between iOS 8 and OS X Yosemite temporarily left some users unable to sync their documents between devices if they elected to upgrade to iCloud Drive on their iOS devices.
That issue is now fixed with OS X Yosemite launching to the public, and Craig Federighi gave a very brief walkthrough of the feature at yesterday's media event, outlining how Mac and iOS apps can automatically generate their own folders for file storage accessible across devices and platforms.

Apple's iWork updates yesterday extend compatibility beyond the core OS X and iOS apps, and APIs are available to allow third-party developers to offer iCloud Drive support for their apps.
iCloud Drive taps into users' general iCloud storage allotments, with all users receiving 5 GB of space free of charge. But with iOS device backups and the upcoming iCloud Photo Library potentially requiring significant amounts of space, many users will find themselves looking to upgrade to paid storage tiers, which begin at $0.99 per month for 20 GB of space and go up to $19.99 per month for 1 TB.
Article Link: OS X Yosemite Launch Brings Fully Functional iCloud Drive to Mac and iOS