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How do I save a file in the app's storage using the .fileImporter modifier?

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I am trying to save a json file using the .fileImporter modifier. I currently my code supports pulling the name of the file but it doesn't save in a way that I can use it across the app. I have tried to look for a solution for this but I couldn't find one. I hope I have luck here!

Here is my code:

import SwiftUI

struct ContentView: View {
    @State var imported = false
    @State var fileName = ""

    var body: some View {
        VStack (spacing: 30) {
            Button(action: {imported.toggle()}, label: {
                Text("Import")
            })
            Text("file selected is \(fileName)")

        }
        .fileImporter(isPresented: $imported, allowedContentTypes: [.json]) { res in
            do {
                let fileUrl = try res.get()
                self.fileName = fileUrl.lastPathComponent
            } catch{
                print ("error reading: \(error.localizedDescription)")
            }
        }
    }
}

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