Q: Question about iCloud Drive and a Mac running Mavericks
Hi..
I have an older iMac still running v10.9 Mavericks that is stable so I really don't want to upgrade it to El Capitan so I need clarity on something.
If I edit a document on Mavericks, it won't update on devices with iCloud Drive 
Is that correct?
Thanks in advance!
iMac, OS X Mavericks (10.9.5), null
Posted on May 9, 2016 8:59 PM
Carolyn Samit wrote:
Hi..
I have an older iMac still running v10.9 Mavericks that is stable so I really don't want to upgrade it to El Capitan so I need clarity on something.
If I edit a document on Mavericks, it won't update on devices with iCloud Drive.
Is that correct?
Thanks in advance!
Yes, according to iCloud Drive FAQ - Apple Support:
You can't use iCloud Drive on your devices until you update your iPhone, iPad, and iPod touch to the latest version of iOS, and your Mac to the latest version of OS X. If you already upgraded and need to use a device that doesn't support iCloud Drive, you can still work on your documents locally, but they won't be up to date with documents on your updated devices, or on iCloud.com.
Additionally, System requirements for iCloud - Apple Support should be helpful.
Posted on May 9, 2016 9:03 PM