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

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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
  1 Comment
Eric Prandovsky
Eric Prandovsky on 11 Nov 2020
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
iCloud Drive Options

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