Upload image or file into server using 3D C#

I want to upload an image from 3D but i am getting elow error:

Error during upload: 405 Method Not Allowed UnityEngine.Debug:Log(Object)

Below is code snippet C# script:

private string m_LocalFileName = "C:/Content/images/annual.png"; private string m_URL = "http://52.81.27.216/Unity/upload.php"; // Use this for initialization IEnumerator UploadFileCo(string localFileName, string uploadURL) { WWW localFile = new WWW("file:///" + localFileName); yield return localFile; if (localFile.error == null) Debug.Log("Loaded file successfully"); else { Debug.Log("Open file error: "+localFile.error); yield break; // stop the coroutine here }

     WWWForm postForm = new WWWForm();
     // version 1
     //postForm.AddBinaryData("theFile",localFile.bytes);
     
     // version 2
     postForm.AddBinaryData("file",localFile.bytes,"annual.png","image/png");
     
     WWW upload = new WWW(uploadURL,postForm);        
     yield return upload;
     if (upload.error == null)
         Debug.Log("upload done :" + upload.text);
     else
         Debug.Log("Error during upload: " + upload.error);
 }
 
 void UploadFile(string localFileName, string uploadURL)
 {
     StartCoroutine(UploadFileCo(localFileName, uploadURL));
 }
 
 void OnGUI()
 {
     GUILayout.BeginArea(new Rect(0,0,Screen.width,Screen.height));
     m_LocalFileName = GUILayout.TextField(m_LocalFileName);
     m_URL           = GUILayout.TextField(m_URL);
     if (GUILayout.Button("Upload"))
     {
         UploadFile(m_LocalFileName,m_URL);
     }
     GUILayout.EndArea();
 }

php code snippet:

$f3->route('POST /test', function() if(isset($_FILE['file']; { echo "Success!"; } else { echo "Failed!"; } }