Add an environment object to UIDocumentPickerViewController - swift

Question

I'm trying to import mp3 files into my app from outside the app's sandbox using the file browser. I have a "store" environment object where i have the folder URL to which I'd like to move the selected file. I want to add that store as an environment object to the file picker.
Here's how I call the document picker from a view (here's just the relevant code):
struct libraryView: View {
#State var filePicker : DocumentPicker
#EnvironmentObject var store : MusicStore
#State var showPicker = false
func presentDocumentPicker() {
let viewController = UIApplication.shared.windows[0].rootViewController!
let controller = filePicker.viewController
viewController.present(controller, animated: true)
}
var body: some View {
Button(action: {showPicker = true
presentDocumentPicker()
}, label: {
Image(systemName: "plus").imageScale(.large)
})
}}
And here's the document picker code:
final class DocumentPicker: NSObject, ObservableObject {
#EnvironmentObject var store : MusicStore
lazy var viewController: UIDocumentPickerViewController = {
let vc = UIDocumentPickerViewController(documentTypes: types, in: .import)
vc.delegate = self
vc.allowsMultipleSelection = self.allowsMultipleSelection
return vc
}()
}
extension DocumentPicker: UIDocumentPickerDelegate {
func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
callback(urls)
do {
let filePath = try FileManager.default.contentsOfDirectory(at: url.deletingLastPathComponent(), includingPropertiesForKeys: nil, options: [])[0]
let audioFile = try Data(contentsOf: filePath)
// let destinationURL = store.folderURL!.appendingPathComponent(filePath.lastPathComponent)
// try FileManager.default.moveItem(at: filePath, to: destinationURL)
// print("File moved to documents folder")
}
catch {
print(error)
}
}
}
Here's the store code:
class MusicStore : ObservableObject {
var folderURL : URL?
init(){
do{
self.folderURL = try FileManager.default.url(
for: .documentDirectory,
in: .userDomainMask,
appropriateFor: nil,
create: false
)} catch(let error) {
print(error.localizedDescription)
}
}
So I want to import the file to my app's sandbox within the documentPicker function, like in the commented code. But I can't add an environment object to the view controller. I don't know whether it's possible at all to do it because I'm using the root view controller to show the document picker.