On a real iOS device, I am unable to write data to overwrite a file in my bundle. I am getting an error You don't have permission to save the file "CU_config.js" in folder "2023". Here is the code that tries to write the file. func configure() { let picker = UIDocumentPickerViewController(forOpeningContentTypes: [.javaScript], asCopy: true) picker.delegate = self present(picker, animated: true) } func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) { controller.dismiss(animated: true, completion: nil) urls.forEach { url in let sourceURL:URL if(isMatch){ sourceURL = Bundle.main.bundleURL.appendingPathComponent("www/2023/CU_config").appendingPathExtension("js") }else{ sourceURL = Bundle.main.bundleURL.appendingPathComponent("www/2023/CU_Pit_config").appendingPathExtension("js") } let destURL = url let incoming:Data? do { incoming = try Data(contentsOf: destURL) }catch{ incoming = nil print("Unable to find file") let alert = UIAlertController(title: "Error", message: "Unable to find file", preferredStyle: UIAlertController.Style.alert) alert.addAction(UIAlertAction(title: "Ok", style: UIAlertAction.Style.default, handler: nil)) self.present(alert, animated: true, completion: nil) } do { sourceURL.startAccessingSecurityScopedResource() try incoming!.write(to: sourceURL) sourceURL.stopAccessingSecurityScopedResource() }catch{ let alert = UIAlertController(title: "Error", message: "Unable to write file"+error.localizedDescription, preferredStyle: UIAlertController.Style.alert) alert.addAction(UIAlertAction(title: "Ok", style: UIAlertAction.Style.default, handler: nil)) self.present(alert, animated: true, completion: nil) print("Unable to write file") } webview.reload() } } I tried giving it permission in the info.plist by using "Application supports iTunes file sharing" but that didn't work. It works perfectly in simulation.

I learned that I can't have a file inside the bundle if I want it to be able to be changed while the app is running. If I have a file stored outside, how could I let an HTML website access that JS file? I'm using WKWebView to run a local website. The JS would need to be accessible by the website before it loads, because it is a configuration file that is needed on load.