Thank you Nate, been struggling with this for weeks and stopping the documents folder syncing worked a treat.
Once you’d pointed me in this direction, there’s a way to have both iCloud sync Documents and a working Zwift.
With Zwift closed:
1 - Move the Zwift folder from Documents to your home directory. Easiest way:
a) Open your documents folder in Finder
b) From the file menu, open a New Tab. In that second tab, use the Go menu and select ‘Home’.
c) Drag the ‘zwift’ folder from the documents tab to the home tab.
2 - Create a symbolic link in the Documents folder to zwift folder you’ve just moved:
a) Open the terminal app
b) Run these two commands:
cd Documents
ln -s ../Zwift
That should be you all set even when iCloud is syncing the Documents folder. Works for me, anyway.