upload-button.html

<label
    {% if include.action %}
        data-pat-inject="
            url: {{ include.action }}; 
            source: #{{ include.id }}; 
            target: #{{ include.id }}"
    {% endif %}
    class="
        pat-button
        file-upload-button">
    {% include patterns/i18n id="patterns.label_upload_imp" %}
    <input 
        tabindex="0"
        name="attachments"
        {% if include.accept %}accept="{{ include.accept }}"{% endif %}
        {% if include.multiple == true %}multiple{% endif %}
        type="file">
</label>