How to pass image file with variable value in ajax and php

I am working on PHP and AJAX to upload image in a folder and message value(any textbox and textarea value). The code is working for image upload by ajax and PHP but I don't know how to pass message variable value.

<!DOCTYPE html>
<body>
    <span id="msg" style="color:red"></span><br/>
     <textarea name="message" class="form-control" id="message"></textarea>
    <input type="file" id="photo"><br/>
     <button class="btn btn-success" id="save">Save</button>
   <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script type="text/javascript">
    $(document).ready(function(){
    $(document).on("click", "#save", function () {
         var message = $("#message").val();
        var property = document.getElementById('photo').files[0];
        var image_name = property.name;
        var image_extension = image_name.split('.').pop().toLowerCase();

        if(jQuery.inArray(image_extension,['gif','jpg','jpeg','']) == -1){
          alert("Invalid image file");
        }

        var form_data = new FormData();
        form_data.append("file",property);
        $.ajax({
          url:'insert2.php?'+message,
          method:'POST',
          data:form_data,
          contentType:false,
          cache:false,
          processData:false,
          beforeSend:function(){
            $('#msg').html('Loading......');
          },
          success:function(data){
            console.log(data);
            $('#msg').html(data);
          }
        });
      });
    });
  </script>
</body>
</html>

The image is uploading in a folder but the message is undefined when I click save button .

<?php
if($_FILES['file']['name'] != ''){
    $test = explode('.', $_FILES['file']['name']);
    $extension = end($test);    
    $name = rand(100,999).'.'.$extension;

    $location = 'testimg/'.$name;
    move_uploaded_file($_FILES['file']['tmp_name'], $location);

    echo '<img src="'.$location.'" height="100" width="100" />';
    echo $message = $_POST['message'];
}
  
?>

It's giving me undefine message value on the PHP page. Screenshot

What is the best way to pass file and box values using ajax for PHP file?