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I have some question about call directory extension How much phone data can be saved to call directory extension? How to get free space of call directory extension programally? (Background) I'm developing iOS app using call directory extension, and I want to save phone data as much as possible. But I don't know how much phone data can be saved and how to get free space programally. so, I can't handle saving operation proprorly. Thanks for your help.

## Environement- iOS 13.3, 13.4- Devise iPhone8, iPhone11 Pro## About my app- My app use Call Directory Extension- Data FlowFetch data from server -> Save data to Realm -> Share data to App groups -> Load data to Call Directory Extension## ExplanationCase 1When I install my app via testFlight, I turned Settings->Phone->Call blocking & identification enable. loading does not stop.Case 2After I turned Settings->Phone->Call blocking & identification disable, I turned it enable. loading does not stop.※When I turned Call blocking & identification enable, I killed my app.※In either case, if I delete app and reinstall it, the swith of Settings->Phone->Call blocking & identification is enabled.I dont know whether this is os bug or application bug .Please share What should I do.