Hi，everyone. :) Recently, I'm trying to make AppClip for my project. When I tried to use NSURLSessionDownloadTask[created by NSURLSession which is initialized with the config backgroundSessionConfigurationWithIdentifier] to download a file with a legal HTTPS URL. It's finally failed 1)Environment: MasOS BigSur Xcode 12.2 Simulator [Run with automatic profile settings] 2)Confusion: The Main Target's download function is normal in the simulator with automatic profile settings.[Someone's advise, I just wanted to try] 3)The Error Info: Trigger Paths: Run AppClip->didFinishLaunchWithOptions->Initialize DownloadSessionTask->Task Resume.[UIApplicationState = UIApplicationStateActive] callBack:URLSession:task:didCompleteWithError below is lldb outputs: 2020-12-10 16:39:45.199333+0800 MFWAppClip[78965:2018825] BackgroundSession <73023646-DBBD-4BD9-B9EF-D79C9DB0B3AB> connection to background transfer daemon interrupted 2020-12-10 16:39:47.716800+0800 MFWAppClip[78965:2022242] Task <E6284F80-16C0-498B-A521-B3F9F67F1C92>.<1> finished with error [-1] Error Domain=NSURLErrorDomain Code=-1 "unknown error" UserInfo={NSErrorFailingURLStringKey=*****, NSErrorFailingURLKey=*******, _NSURLErrorRelatedURLSessionTaskErrorKey=( 		"BackgroundDownloadTask <E6284F80-16C0-498B-A521-B3F9F67F1C92>.<1>" ), _NSURLErrorFailingURLSessionTaskErrorKey=BackgroundDownloadTask <E6284F80-16C0-498B-A521-B3F9F67F1C92>.<1>, NSLocalizedDescription=unknown error} 2020-12-10 16:39:51.123990+0800 MFWAppClip[78965:2018825] BackgroundSession <73023646-DBBD-4BD9-B9EF-D79C9DB0B3AB> an error occurred on the xpc connection to setup the background session: Error Domain=NSCocoaErrorDomain Code=4097 "connection to service on pid 0 named com.apple.nsurlsessiond" UserInfo={NSDebugDescription=connection to service on pid 0 named com.apple.nsurlsessiond} 	 Your opinions and suggestions would be greatly appreciated！~