iCloud sync is not working. Help!

A note about iCloud Drive, Yosemite and iOS 8
When you upgrade to iOS 8 or OS X 10.10, you will be prompted to upgrade to iCloud Drive. If you choose to upgrade, your iOS 8 devices and OS X 10.10 Macs can no longer transfer files to iOS 7 devices or Macs running OS X 10.9 or earlier. You should only upgrade to iCloud Drive if your Macs are running OS X 10.10 Yosemite, and your other iOS devices are on iOS 8.

iCloud sync is getting more reliable all the time, but sometimes issues can arise. If you find you are having trouble getting it working how you would like, here are some points to consider.

1. If you can see the Mental Case iCloud settings, but the main switch is greyed out (disabled), you need to go to the Settings app, and into the iCloud section, and login. You also need to make sure that iCloud Drive is turned on for Mental Case.
   
2. Copying data from one device via the cloud to another device takes time, and it can take even longer if you are on a mobile network. Sometimes the best solution to an iCloud issue is patience. Just wait an hour, and try again. Usually, the more you switch iCloud sync off and on (or reset), the more erratic it will behave.
   
3. Transferring data goes faster when you are on a better network. Best to setup your sync on a fast Wi-Fi network, rather than a mobile network.
   
4. iCloud has the ability to bypass the internet in some cases. If you are syncing two devices, the transfer may go faster if they are both on the same local network at the same time.
   
5. If you find that changes from one device are not appearing on other devices, it may be that that device did not get time to transfer its data before being shut down. Turn the device on, and connect to a fast network to see if that helps.
   
6. Sometimes the process on your iPhone that handles iCloud can get in an inconsistent state and is not able to recover. Turning your device off and then back on may help remedy this.
   
7. If just turning your iOS device off and then back on does not help, try a reset: Hold the on/off button in at the same time as the home button until the device turns off (around 8 seconds). Wait for the device to launch again.
   
8. Try signing out of iCloud in the Settings app, and then signing back in again.
   
9. If you decide you want to start over with iCloud, go to the iCloud settings in each Mental Case app and tap the 'Reset' button. Wait 30 minutes, tap the Reset button on each device again, and finally turn on sync on each device. Then patiently wait for the data to transfer. This can take a while.
   
10. We have seen cases where iCloud can get completely stuck on a Mac. When this happens, any changes you make on the Mac never appear on other devices, even though changes on the other devices do appear on the Mac. If this happens, you probably need to reset the iCloud data on the Mac:
    
    • Quit all applications
    • Go to Finder, and select the menu item Go > Go to Folder
    • Enter this exactly as shown: ~/Library/Application Support
    • Drag the Ubiquity folder to the Trash
    • Restart the Mac
11. Finally, if you still have trouble, please email our help desk (support@mentalfaculty.com).

If none of these suggestions help, there are even more options mentioned on this page:
http://support.iawriter.com/help/kb/general-questions/icloud-wont-w...