PHP Upload progress

After 3 whole days of testing, researching and failing I need your help please on this one.

I have this HTML form

<form action="upload.php" method="POST" enctype="multipart/form-data" target="upload_target" >
    <input type="hidden" name='<?php echo ini_get("session.upload_progress.name"); ?>"' value="myUploadProgress">
    <input type="file" name="myfile" id="file1" style="display:none">
    <button id="browse-button">Browse</button>
    <input id="update-button" class="disabled" type="submit" name="submitBtn" value="Update" />
</form>

and I separated my php in to 2 steps:

1. upload.php - posting the form

   <?php
       session_start();
   
       getcwd().DIRECTORY_SEPARATOR;
   
       chdir('/tmp');
   
       $destination_path = getcwd();
   
       $result = 0;
   
       $target_path = $destination_path . '/' .basename( $_FILES['myfile']['name']);
   
       if(@move_uploaded_file($_FILES['myfile']['tmp_name'], $target_path)) {
           $result = 1;
       }
   
       sleep(1);
   ?>
   

2. upload_status.php - fired by an ajax request on 1000ms interval

   <?php
   
       print_r($_SESSION);
   
   ?>
   

for some reason I keep getting $_SESSION as empty and I expected to get $_SESSION["upload_progress_myUploadProgress"] (or something else) as array of vars of my current upload.

Things that I have checked and already in my php.ini

• file_uploads: On
• post_max_size: 2G
• upload_max_filesize: 2G
• output_buffering: off
• session.upload_progress.cleanup: On
• session.upload_progress.enabled: On
• session.upload_progress.freq: 1%
• session.upload_progress.min_freq: 1
• session.upload_progress.name: PHP_SESSION_UPLOAD_PROGRESS
• session.upload_progress.prefix: upload_progress_