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How to change image

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I have thumbnail image and upload image.
When upload image is changed, how to display thumbnail image ?

<table>
   <tbody>
      <tr>
         <td >
         <?php
            $ih = Loader::helper('image');
            $image = File::getByID(1);
            $thumbnail = $ih->getThumbnail($image, 50, 50, true);
            ?>
            <img src="<?php echo $thumbnail->src; ?>">
         </td>
         <td>
            <?php
               $bf = File::getByID(1);
               $al = Loader::helper('concrete/asset_library');
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