title: Prestashop I can't upload product images from backend
body: <p>I can't upload product images from backend, always the last image is incomplete and doesn't upload, no matter if is a single image o are multiples images, the progress bar is freeze.</p>
  
  <p>I deleted the cache, I activated the debug mode, I checked the php_error.log and prod.log, dev.log in the prestashop installation and I can't see any error there. Well, I only can to see an Ajax error in debug mode and browser console, a POST petition without status response (see attachments). How I Can debug this?</p>
  
  <p>The images are very small &lt; 500kb. </p>
  
  <p><a href="https://i.stack.imgur.com/kHirD.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/kHirD.png" alt="enter image description here"></a>
  <a href="https://i.stack.imgur.com/M6G1c.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/M6G1c.png" alt="enter image description here"></a>
  <a href="https://i.stack.imgur.com/x4UGu.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/x4UGu.png" alt="enter image description here"></a>
  <a href="https://i.stack.imgur.com/thy9s.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/thy9s.png" alt="enter image description here"></a></p>
  
  <p>What setting or log I must to check?</p>
  
  <p>My current settings are:</p>
  
  <ul>
  <li><strong>OS</strong>: Ubuntu 18.04.2 </li>
  <li><strong>Prestashop</strong>: 1.7.5.2</li>
  <li><strong>Folders Permissions</strong>: 755</li>
  <li><strong>Files Permissions</strong>: 644</li>
  <li><strong>PHP</strong>: 7.1 
  
  <ul>
  <li>memory_limit = 1024M </li>
  <li>max_execution_time = 300</li>
  <li>max_input_time = 300</li>
  <li>upload_max_filesize = 20M</li>
  <li>post_max_size = 20M</li>
  <li>max_input_vars = 10000</li>
  <li>safe_mode = off    </li>
  </ul></li>
  <li><strong>Browsers</strong>: Chrome, Firefox, Opera.</li>
  </ul>