Uploading Wav Audio File to Server

Hello, I have an mobile game that needs to record audio using the microphone and then upload these clips to the server. Been looking for a way to do this but I just can't figure how, There are examples of images being uploaded but when I follow through with the same method for Audio then that saves a blank file. I used SavWav and I was able to save the file to local memory but I am not able to figure how to upload it to a sever. Right now I have it working like this (pretty sure this is wrong)

 public bool UploadToWeb(AudioClip clip)
     {
 
         var filename = "sample";
 
 
         if (!filename.ToLower().EndsWith(".wav"))
         {
             filename += ".wav";
         }
 
         var samples = new float[clip.samples];
 
         clip.GetData(samples, 0);
 
         Int16[] intData = new Int16[samples.Length];
         Byte[] bytesData = new Byte[samples.Length * 2];
 
         int rescaleFactor = 32767; 
 
         for (int i = 0; i < samples.Length; i++)
         {
             intData[i] = (short)(samples[i] * rescaleFactor);
             Byte[] byteArr = new Byte[2];
             byteArr = BitConverter.GetBytes(intData[i]);
             byteArr.CopyTo(bytesData, i * 2);
         }
                StartCoroutine (UploadFile (bytesData));
 }
 
 public IEnumerator UploadFile(Byte[] uploadBytes) {
 
         WWWForm form = new WWWForm();
         form.AddBinaryData("fileUpload", uploadBytes, "sample.wav", "audio/wav");
 
         WWW w = new WWW(weburl, form);
         yield return w;
 
         if (!string.IsNullOrEmpty(w.error)) {
             Debug.Log(w.error);
         }
         else {
             Debug.Log("Finished Uploading Screenshot");
         }
 
 }
 

Here is the php script I was trying to use.

 <?php
 
     $byteArray = $_POST['audioArray'];
     
     $myfile = fopen("sine.wav", "wb") or die("Unable to open file!");
     fwrite($myfile, $byteArray);
     fclose($myfile);   
 
 ?>

Can someone please help me with how is this meant to be done?