{# Required: input_name  #}
<div id="{{input_name}}_upload_container" class="dnd-container" >
    <div class="dnd-background">
        ... or drag 'n drop
    </div>
    <input type="file" name="{{input_name}}" id="{{input_id if input_id else input_name}}" class="dnd-input" />
</div>