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I am writing a code to capture the accelerometer data for one hour, it suppose to save in the iOS device first, and then I would like to upload to cloudkit. Here is my code. import UIKit import CoreMotion import CloudKit class ViewController: UIViewController { @IBOutlet weak var accelerometerSwitch: UISwitch! private let recorder = CMSensorRecorder() private let cloudKitContainer = CKContainer(identifier: "iCloud.com.example.accelerometer-recorder") override func viewDidLoad() { super.viewDidLoad() accelerometerSwitch.addTarget(self, action: #selector(accelerometerSwitchValueChanged), for: .valueChanged) } private func saveDataToAppFolder(data: [CMSensorRecordingData]) { let fileName = "accelerometer_data.dat" let fileManager = FileManager.default let documentsDirectoryURL = fileManager.urls(for: .documentDirectory, in: .userDomainMask).first! let fileURL = documentsDirectoryURL.appendingPathComponent(fileName) let jsonData = try! JSONEncoder().encode(data) try! jsonData.write(to: fileURL) } @objc private func accelerometerSwitchValueChanged() { if accelerometerSwitch.isOn { recorder.recordAccelerometer(forDuration: 3600.0) { sensorData in if let sensorData = sensorData { // Handle the recorded data saveDataToAppFolder(data: sensorData) uploadDataToCloudKit(data: sensorData) } else { print("No accelerometer data recorded") } } } else { // No need to stop recording since it will stop automatically after the duration } } private func uploadDataToCloudKit(filePath: String) { let fileURL = URL(fileURLWithPath: filePath) let data = try! Data(contentsOf: fileURL) let record = CKRecord(recordType: "RecordedData") record["data"] = data let database = cloudKitContainer.publicCloudDatabase database.save(record, completionHandler: { record, error in if let error = error { print("Error uploading data to CloudKit: \(error)") } else { print("Data uploaded to CloudKit successfully") } }) } } Anyone can help to fix the error. Thanks a lot.