file_upload.pt

<p tal:define="preview_url cstruct.get('preview_url');
               ext str(cstruct.get('filename').split('.')[-1:][0]).lower()|[];">
    <tal:block tal:condition="preview_url and ext in ['jpg','jpeg','png','bmp','gif']">
    <img src="${structure: preview_url}" style="width:100px;height:auto;"></img>
    <br>
    </tal:block>
    <a class="label label-default" href="${structure: preview_url}"
    target="_blank"><i class="fa fa-search"></i> View</a>
</p>