title: How to add a new image field in opencart
body: <p>Hello guys I want to add a new image field in <code>opencart2</code> on return product page</p>
  
  <p>How can I add <code>image</code> field in opencart</p>
  
  <p>I have done as far :</p>
  
  <p><code>view  : return_form.tpl</code></p>
  
  <pre><code>&lt;div class="form-group"&gt;
              &lt;label class="col-sm-2 control-label" for="input-comment1"&gt;&lt;?php echo $entry_image; ?&gt;&lt;/label&gt;
              &lt;div class="col-sm-10"&gt;
               &lt;input type="file" name="error_img"&gt;
              &lt;/div&gt;
            &lt;/div&gt;
  </code></pre>
  
  <p>In controller <code>return.php</code> in function <code>add</code></p>
  
  <pre><code>if (isset($this-&gt;request-&gt;post['error_img'])) {
              $data['error_img'] = $this-&gt;request-&gt;post['error_img'];
          } else {
              $data['error_img'] = false;
          }
  </code></pre>
  
  <p>but when I am trying to print the value of <code>$this-&gt;request-&gt;post['error_img']</code> it is returning blank</p>
  
  <p>what I am missing</p>