I have an image field on a Core Data entity with "Allows External Storage" enabled. When I delete a record, the external binary data file remains on disk. How can I ensure that all externally stored data is deleted along with the record?

I'm trying to run the passkeys demo app from the page Connecting to a service with passkeys, and after following the directions there, when running the app I get the following error: 2022-11-13 10:09:12.514544+0100 Shiny[1413:277579] [Authorization] ASAuthorizationController credential request failed with error: Error Domain=com.apple.AuthenticationServices.AuthorizationError Code=1001 "(null)" 2022-11-13 10:09:12.515545+0100 Shiny[1413:277317] Request canceled. When I search for this on Google, I get a bunch of results about Sign in with Apple, not about passkeys. Can anyone help me make sense of this?

Is there a demo app for using passkeys with SwiftUI? So far I've only been able to find this one using UIKit, and I can't tell if it's possible to port it to SwiftUI, or if I have to use UIKit.