iCloud Drive decided to fill up my storage tier by reserving 50 gigs. Why?
Edit: A Senior AppleCare Advisor was able to release the reserved space back to my account.
My 15 Retina MacBook Pro after upgrading to 10.12.4 asked me if I'd like to extend my iCloud Drive to my Desktop and Documents folder. I declined but then it reserved 50 gigs on my account taking me from using 30 gigs to 80. I only pay for the 50 gig tier so this posed a problem. When I tried to manage the space it showed I only had 100mb in documents and when I looked at my documents folder it only contained about a gig of stuff. A Senior AppleCare Advisor was required to release the "reserved" space back to my account.
TL;DR iCloud Drive reserved 50 gigs, AppleCare Advisor fixed it.
MacBook Pro (Retina, 15-inch, Mid 2014), macOS Sierra (10.12.4)