Want to do cloudkit development? First upgrade to IOS 8 Beta 5 and yos.

In Monday, Apple said in an email to developers that the latest features such as ICloud Drive, Mail Drop, ICloud Photo Library, Safari History, call History, Cloudkit, and so on at least IOS 8 Beta 5 and OS X Yosemite DP 5 are running.

From today, developers who want to continue to do cloudkit related development must upgrade to the MAC and IOS version of the system.

The series of new features mentioned above will make Icloyd more powerful and more existential in Apple's software ecosystem. For example, mail Drop allows e-mail users to send a maximum of 5GB of attachments; ICloud Photo Library allows users to share, store, edit, and transfer photos easily and quickly among different devices.