In my Iphone app, I want to open json files that I have earlier saved. The function I mention below to open the file is not firing when I share a file to my app. I have implemented this in the info.plist file and this seems to work, because in Files I can share a .json file to may app. <key>CFBundleDocumentTypes</key> <array> <dict> <key>CFBundleTypeName</key> <string>JSON Document</string> <key>LSHandlerRank</key> <string>Alternate</string> <key>LSItemContentTypes</key> <array> <string>public.json</string> </array> </dict> </array> I have added the function to open the file in my AppDelegate file. func application(_ application: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool { // Handle the file at the given URL // You can perform actions based on the file type or content print("Opening file!") } (the implementation is actually longer to work on the file). When I share a file to my app, the app itself is opening but this method 'application' is never called. I'm not sure whether I'm overlooking something. I have searched quite a while to see what I'm missing. Any help is greatly appreciated! Emile