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Sending recorded audio file to server by using Alamofire 5 beta newest Version

my intention is it to have an watch application that can record audio files and send the recorded audio files to the server. In order to communicate with the server, I am using the newest version of Alamofire. I got the Status code: 200. That means the communication with the server is successful.

Have I sent the recorded audio file properly by doing so? And will the server be able to receive the m4a file in an m4a format and could also play it back? (That’s my desire).

I am still a great beginner in swift. Is this the proper way to send the audio file? Advices, suggestions, and code improvements are very welcome.

Here is my code and a screenshot of the output screen:


And here is my code:

//  AudioInterfaceController.swift
//  AudioTestEx WatchKit Extension

import WatchKit
import Foundation
import AVFoundation
import Alamofire

class AudioInterfaceController: WKInterfaceController {

    var outputURL: URL!

    override func awake(withContext context: Any?) {
        super.awake(withContext: context)

        // Configure interface objects here.

    override func willActivate() {
        // This method is called when watch view controller is about to be visible to user

    override func didDeactivate() {
        // This method is called when watch view controller is no longer visible

    @IBAction func playFile() {

            with: outputURL,
            options: nil,
            completion: {_,_,_ in })

    @IBAction func recordFile() {
        outputURL = MemoFileNameHelper.newOutputURL()

        let preset = WKAudioRecorderPreset.narrowBandSpeech

        let options: [String:Any] = [WKAudioRecorderControllerOptionsMaximumDurationKey: 10]
        presentAudioRecorderController(withOutputURL: outputURL, preset: preset, options: options,  completion: { saved, error in

            if let err = error {

    @IBAction func sendFile() {
   let fileName = outputURL.lastPathComponent
    guard let audioFile: Data = try? Data (contentsOf: outputURL) else {return}
    AF.upload(multipartFormData: { (multipartFormData) in
    multipartFormData.append(audioFile, withName: "audio", fileName: fileName, mimeType: "audio/m4a")
    }, to: "").responseJSON { (response) in


class MemoFileNameHelper {

    /// A date formatter to format Date to a string suitable to be used as a file name.
    static let dateFormatterForFileName: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyyMMddHHmmssZZZ"
        return formatter

    /// Returns a new unique output URL based on user's document directory for to-be-saved voice memo.
    static func newOutputURL() -> URL {
        let dateFormatter = MemoFileNameHelper.dateFormatterForFileName
        let date = Date()
        let filename = dateFormatter.string(from: date)
        let documentsDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
        let output = documentsDirectoryURL.appendingPathComponent("\(filename).m4a")
        return output

I hope anyone can help me out. Thank you very much.

@uniqueyung91 Do you still have issues with this?

Yes, I still have that issue. I am not clear whether the way I do it, is correct in that way. I hope you can help out