Icloud Drive Issue: "[Documentmanager] Failed to Associate Thumbnails for Picked Url"

why my UIDocumentPickerViewController returns me a url not reachable?

I am using UIDocumentPicker like below and it works fine:

First I have an enum,

enum UploadFileType{
    case photo
    case file
}

Then a structure:

struct UploadFileData {
    var fileName: String
    var fileType: UploadFileType
    var fileData: NSData
}

var file: UploadFileData?

func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentAt url: URL) {
    let fileManager = FileManager.default
    print(fileManager.fileExists(atPath: url.path))
    let data = NSData(contentsOfFile: url.path)
    guard let doc = data else {
        //  Utility.showAlert(message: Strings.ERROR.text, title: Strings.DOCUMENT_FORMAT_NOT_SUPPORTED.text, controller: self)
        return
    }
    self.file = UploadFileData(fileName: "\(url)", fileType: .file, fileData: doc)
    guard let dataFile = self.file?.fileData as Data? else {return}
}

Picking a Folder from iCloud with Document Picker

You are getting this error because you are getting the path of the folder in which your files exist and like @ivan-ičin has said in the comments you cannot pick an entire folder from iCloud according to the documentation.

So if you are trying to upload all the files of a specific folder to your server i would suggest you get the URL of the folder and then using the below code you can get a list all the files present in that folder.

Here is how you can get a list of all the files present in the documents folder that you are trying to pick.

let fileManager = FileManager.default
let documentsURL = "YOUR FOLDER URL"
//If all files are in your app document directory then use this line
//fileManager.urls(for: .documentDirectory, in: .userDomainMask)[0]

do {
    let fileURLs = try fileManager.contentsOfDirectory(at: documentsURL, includingPropertiesForKeys: nil)
    // Append files to an array here and then iterate the array later and upload files to server one by one.
} catch {
    print("Error while enumerating files \(documentsURL.path): \(error.localizedDescription)")
} 

Once you get the URLs you can append them to an array and upload them one by one to your server using Alamofire.

Swift IOS - How can I obtain permission to upload a document when testing on a device?

I figured it out based on an answer I found here.

What I was doing is: I was storing a reference to the local file, which is a security scoped resource. Hence the permission error was thrown.

What I did to get around this: At the moment when the user picks the file, I will use url.startAccessingSecurityScopedResource() to start accessing its content and make a copy of the file instead of holding its reference.

Here is the updated code for the picker didPickDocumentsAt:

func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
        guard controller.documentPickerMode == .open, let url = urls.first, url.startAccessingSecurityScopedResource() else { return }
        defer {
            DispatchQueue.main.async {
                url.stopAccessingSecurityScopedResource()
            }
        }
        
        do {
            let document = try Data(contentsOf: url.absoluteURL)
            parent.file = document
            parent.fileName = url.lastPathComponent
            print("File Selected: " + url.path)
        }
        catch {
            print("Error selecting file: " + error.localizedDescription)
        }
        
    }

And then my Storage upload function is:

func UploadFile(doc: DocumentReference, completion:@escaping((Bool?, String?) -> () )) {
    do {
        let StorageReference = Storage.storage().reference().child(self.User + "/" +  doc.documentID + "/" + fileName!)
        StorageReference.putData(file!, metadata: nil) { (metadata, error) in
            if let error = error {
                self.alertMessage = error.localizedDescription
                self.showingAlert = true
                completion(false, nil)
            }
            else {
                StorageReference.downloadURL { (url, error) in
                    if let error = error {
                        self.alertMessage = error.localizedDescription
                        self.showingAlert = true
                        completion(false, nil)
                    }
                    else {
                        ShortenUrl(from: url!.absoluteString) { result in
                            if (result != "") {
                                completion(true, result)
                            }
                            else {
                                completion(false, nil)
                            }
                        }
                    }
                }
            }
        }
    }
    catch {
        self.alertMessage = "Error uploading file: " + error.localizedDescription
        self.showingAlert = true
        completion(false, nil)
    }
}

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