I am cutting on a Mac 10.13.4 using Media Composer 8.3.1
In trying to solve an email problem, I have managed to send my entire desktop to my iCloud Drive, including all my Avid projects!
In trying to solve an email problem I went into my System Preferences, into iCloud, into iCloud Options and in a moment of sheer stupidity deselected the top option of Desktop & Documents Folders.
What is happening now is all my documents have dissapeared from my desktop and are transferring onto my iCloud Drive.
Call Apple about this problem, they should be able to help you.
"MY MEDIA/PROJECT MOTTO: If you think three copies of your Media or Projects are enough. Take a moment to place a value on them and then maybe add two more. Hard Drives are now stupidly cheap. A RE-SHOOT AND YOUR TIME AREN'T."