SaveState exception: Cannot Create file, Operation not permitted

  

I test SaveState on my iPad, I follow exactly the same logic on the embarcadero SaveState example, but it throws an exception after saving data.

However, the same logic tested on iOS Simulator is working fine.
I am using Delphi 10.3.1 with an iPad iOS12.2

When I click the home button after the FormSaveState logic executed, the below exception occurred:
Cannot create file ……. Operation not permitted

The same logic tested on iOS Simulator is working fine.
Any idea why this occurred and how to resolve? Thanks for any help!

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