una/modules/base/general/template/attachments.html

<div class="bx-base-general-attachments bx-clearfix">
    <bx_repeat:attachments>
        <div class="bx-base-general-attachment bx-def-box bx-def-color-bg-box bx-def-gal-img-size" style="float:left;">
            <bx_if:image>
                <a href="javascript:void(0);" title="__attr_file_name__" onclick="$('#__popup_id__').dolPopupImage('__url_original__', $(this).parent())">
                    <img class="bx-def-gal-img-size" src="__url_preview__" />
                </a>
                __popup__
            </bx_if:image>
            <bx_if:video>
                __video__
            </bx_if:video>
            <bx_if:not_image>
                <a href="__url_original__" title="__attr_file_name__">
                    <div class="bx-def-round-corners bx-def-padding-sec">__file_name__</div>
                </a>
            </bx_if:not_image>
        </div>
    </bx_repeat:attachments>

    <script type="text/javascript" language="javascript">
        var oAttachments = $('.bx-base-general-attachments');
        if(oAttachments.find('.bx-base-general-attachment').length > 2) {
            oAttachments.flickity({
		cellSelector: '.bx-base-general-attachment',
		cellAlign: 'left',
		pageDots: false,
		imagesLoaded: true
            });
        }
    </script>
</div>