I have written an App with a fileIpmorter modifier. I used TestFlight to pass it to friend for a test. The App works fine until my friend uses the fileImporter function: He can select the file to import (simple csv file), the fileImporter closes without having read out the csv file! I was able to analyze that the do-catch-block within the fileImporter modifier throws an error at the mac of my friend. The App behaves totally different to my Mac: On my Mac it works perfectly: the csv file is read out and the data can be used within the APP. Why does it behave like this? Why does this happen to the mac of my friend but not on mine? More strange: The Apple team is not able to even use the csv-file I passed them in the App Store Connect process: They are not able to select the file in the downloads folder. All three used MAC´s with three different behaviors? - How comes?

I am learning SwiftUI. Error: SwiftUI/Environment+Objects.swift:32: Fatal error: No Observable object of type ViewModel found. A View.environmentObject(_:) for ViewModel may be missing as an ancestor of this view. I do not get the point why this happens. The error is shown in the line : "renderer.render {... import SwiftData import SwiftUI @Observable class ViewModel { var groupNumber: String = "Gruppe" var sumOfHours: Int = 0 var personsToPrint: [Person]? = nil @MainActor func pdfReport(person: [Person]) { if personsToPrint != nil { for person in personsToPrint! { let renderer = ImageRenderer(content: PersonDetailView(person: person)) let url = URL.documentsDirectory.appending(path: "\(person.lastname) \(person.firstname).pdf") print(person.lastname, person.firstname) renderer.render { size, context in var box = CGRect(x: 0, y: 0, width: size.width, height: size.height) guard let pdf = CGContext(url as CFURL, mediaBox: &box, nil) else { return } pdf.beginPDFPage(nil) context(pdf) pdf.endPDFPage() pdf.closePDF() let data = try! Data(contentsOf: url) //pdf muss erst in Daten umgewandelt werden. do { try data.write(to: url) print("Daten wurden hier gespeichert: \(url)") } catch { print("PDF could not be saved!") } } } } } }

I would like to write an App, to store sensitive data. Therefore I want to make sure, that the data is only saved and used on the local device. How can I save/use data of an app only local even if I am using iCloud service generally?