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At about 33:30 of the Demystify SwiftUI video, it indicates the problem is the id isn't stable. Since it is a computed property, the UUID() function is called each time the property is accessed and a different value is returned. The simple fix is to instead use let id = UUID() isn't it or am I still misunderstanding the problem? Thanks, Dave

I have a whiteboard app that when connected to an external screen just shows the whiteboard portion of the screen instead of the entire app screen that includes the various pen tools, etc. When the notification for a second screen is received a second view controller that contains just a UIImage for displaying the whiteboard is created and then whenever the document is updated and a second screen is connected that UIImage is also updated (in addition to the main view on the actual iPad).I don't understand how to support this with the UIWindowSceneDelegate. I have the multi-window working but only the mirror image of the entire iPad image is shown on the second screen. I tried setting up a second SceneDelegate in the Info.plist file as shown below.<key>UIApplicationSceneManifest</key> <dict> <key>UIApplicationSupportsMultipleScenes</key> <true/> <key>UISceneConfigurations</key> <dict> <key>UIWindowSceneSessionRoleExternalDisplay</key> <array> <dict> <key>UISceneClassName</key> <string></string> <key>UISceneDelegateClassName</key> <string>External Display Configuration</string> <key>UISceneConfigurationName</key> <string>reDraw.ExternalSceneDelegate</string> <key>UISceneStoryboardFile</key> <string>ExternalScreen</string> </dict> </array> <key>UIWindowSceneSessionRoleApplication</key> <array> <dict> <key>UISceneConfigurationName</key> <string>Default Configuration</string> <key>UISceneDelegateClassName</key> <string>reDraw.SceneDelegate</string> <key>UISceneStoryboardFile</key> <string>MainDocumentBrowser</string> </dict> </array> </dict> </dict>But I can't figure out what to do differently for the external screen. The scene delegate for the main screen uses the UIDocumentBrowserViewController.presentDocument method to open the document.It doesn't make sense to me to open the document a second time for the external screen. Any help or pointers to code samples would be appreciated.

I cannot open my custom document type (which is a file package/directory) using the UIDocumentBrowserVC (items are grayed out) on a first gen iPad Pro but if I use the Files app and tap on a file for my app, it will open the file in my app but the document window only is centered and only covers about 1/3 of the width of the screen.For any Apple engineers reading this, I filed a bug FB6115685 that now includes a sample project.I see no mention of these issues in the release notes but this seems very broken (in both beta 1 and beta 2)There are also issus UIDocumentBrowserVC not working at all in the simulator. See this thread:http://https://forums.developer.apple.com/thread/118087Are these known issues and any work arounds?