I want to record both IMU data and Audio data from Airpods Pro. I have tried many times, and I failed. I can successfully record the IMU data and iPhone's microphone data simultaneously. When I choose Airpods Pro's microphone in the setCategory() function, the IMU data collection process stopped. If I change recordingSession.setCategory(.playAndRecord, mode: .default, options: .allowBluetooth) to ecordingSession.setCategory(.playAndRecord, mode: .default), everything is okay except the audio is recorded from the handphone. If I add options: .allowBluetooth, the IMU update will stop. Could you give me some suggestions for this? Below are some parts of my code.   let My_IMU = CMHeadphoneMotionManager()   let My_writer = CSVWriter()   var write_state: Bool = false   func test()   {     recordingSession = AVAudioSession.sharedInstance()     do {       try recordingSession.setCategory(.playAndRecord, mode: .default, options: .allowBluetooth)       try recordingSession.setActive(true)       recordingSession.requestRecordPermission() { [unowned self] allowed in         DispatchQueue.main.async {           if allowed == false {print("failed to record!")}         }       }     } catch {       print("failed to record!")     }                 let audioFilename = getDocumentsDirectory().appendingPathComponent("test_motion_Audio.m4a")     let settings = [       AVFormatIDKey: Int(kAudioFormatMPEG4AAC),       AVSampleRateKey: 8000,       AVNumberOfChannelsKey: 1,       AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue     ]     do     {       audioRecorder = try AVAudioRecorder(url: audioFilename, settings: settings)       audioRecorder.delegate = self       audioRecorder.record()     }     catch     {       print("Fail to record!")       finishRecording()     }           write_state.toggle()     let dir = FileManager.default.urls(      for: .documentDirectory,      in: .userDomainMask     ).first!           let filename = "test_motion_Audio.csv"     let fileUrl = dir.appendingPathComponent(filename)     My_writer.open(fileUrl)           APP.startDeviceMotionUpdates(to: OperationQueue.current!, withHandler: {[weak self] motion, error in       guard let motion = motion, error == nil else { return }       self?.My_writer.write(motion)     })   }