Error initializing when MATLAB Hardware Support Package files are moved to iCloud

We are experiencing an error where macOS (Mojave, Catalina & possibly others) offloads some components from the Disk to iCloud.

When running the command to initialize arduino:

a = arduino('/dev/cu.slab_usbtouart','Nano3')

It fails because components are being offloaded from the machine to the cloud

I believe the affected directories for the MATLAB Support Package for Arduino Hardware are /Users/me/Library/Application Support/MathWorks/MATLAB and Documents/MATLAB/Support Packages ... there is no reason they should be offloaded, I can't figure out why macOS it's doing this.

• The only solution I've found is do disable iCloud for Desktop and Documents which isn't always ideal.

macOS: 10.14.6, 10.15.7

Matlab: 2020a, 2020b

Package: MATLAB Support Package for Arduino Hardware 20.1.1, 20.2.0

[Eric Prandovsky]

Possible solutions

• It was suggested to change the MATLAB folder name in /Documents to "MATLAB.nosync". iCloud should ignore this folder in iCloud Backups. You have to Change Your Support Package Directory.
• I believe, The second option would be to Disable the "Optimize Storage" under Settings-->iCloud-->iCloud Drive Options