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communication between live activity and main app

I found the live activity process cannot write to the app group and FileManger, can only read the app group.

When I write using FileManager in a live activity process, the console prompts me with a permission error.

When I write using UserDefault(suit:) in the live activity process, I read a null value in the main app.

Is this the case for real-time event design? I haven’t seen any documentation mentioning this.

Does anyone know, thank you very much.

communication between live activity and main app
 
 
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