A large file is downloading through a background URLSession and the app gets terminated completely (by the system, not a swipe up). When the download finishes, what exactly has to happen in the app, in what order, so you don't lose the file?
The system relaunches the app in the background, handleEventsForBackgroundURLSession in the AppDelegate stores the completionHandler and recreates the session with the same identifier, the delegate's didFinishDownloadingTo moves the file immediately, and didFinishEvents calls the stored handler.
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