The rollout for Apple’s iOS 8 has finally come, and early adopters are feverishly downloading the new mobile operating system.

If you haven't downloaded it just yet, though, you might want to heed at least this one word of caution.

Several sites are now warning iOS 8 users not to enable Apple's new iCloud Drive feature during the installation process.

The reason being, it’s not quite ready to play with other OSs in the Apple family.

Lifehacker explains, "iCloud Drive is only compatible with iOS devices running iOS 8 and Macs running OS X Yosemite."

According to Apple, Yosemite isn't slated to be released until sometime later this year. So until it comes out, iCloud Drive won't properly sync your apps across devices.

If you haven't yet heard of Apple's new iCloud Drive, Mashable explains it's basically the company's answer to cloud-services like Google Drive and Dropbox. (Video via Grovo.com)

And it's an important part of the new OS. CBS calls it "integral," noting, "You can start working on a document on your iPhone, then pick up the project later on your iPad or other device ... Crop or color-correct a photo in one device, and you'll see the latest version in all devices connected to iCloud Drive."

Of course, issues with iCloud Drive don’t have to stop you from grabbing the new OS.

As 9to5Mac notes you can simply tap "Not Now" when asked if you'd like to upgrade to iCloud Drive, then simply upgrade later under the Settings tab.

There are a few other issues you might run into during the update, though, depending on what you've got on your phone. Some users say they simply don't have enough space for the new OS.

The Verge writes, "While previous iOS updates have always required around 1GB of free space, a large number of iPhone and iPad owners are noticing that iOS 8 requires up to 5.7GB of free space to install."

On top of that, if you’re grabbing the new OS you’ll definitely want to look out for any bugs. And, as always, be sure to back up your data.

This video includes an image from Getty Images.