finding a shortcode ?

on this page http://gccre.com.au/ (access pw = ” twist ” )

I have a full width slider – I want to add this slider image and link to a template page for a plug-in
this is a page using the tempolate
http://gccre.com.au/commercial/professional-offices-2/

for the moment I have just used the code generated on the page (shown below) and the image sits there ok – but I know it is not correct and will not update if the slider is updated in the admin

I’ve manage to discover the shortcode (hook or whatever its called) for the widget panel

but can you tell me what the shortcode/hook is or where/how I can find it?

here is the code I have used for the moment

<div id="full_slider_2" class="avia-fullwidth-slider main_color avia-shadow   avia-builder-el-5  el_after_av_one_third  avia-builder-el-last  slider-not-first container_wrap fullsize"><div data-size="no scaling" data-lightbox_size="large" data-animation="slide" data-ids="16703" data-video_counter="0" data-autoplay="false" data-bg_slider="false" data-slide_height="" data-handle="av_slideshow_full" data-interval="5" data-class=" " data-css_id="" data-scroll_down="" data-control_layout="av-control-default" data-custom_markup="" data-perma_caption="" data-autoplay_stopper="" data-image_attachment="" data-min_height="0px" data-src="" data-position="top left" data-repeat="no-repeat" data-attach="scroll" data-stretch="" class="avia-slideshow avia-slideshow-2  av-control-default avia-slideshow-no scaling av_slideshow_full   avia-slide-slider" itemprop="ImageObject" itemscope="itemscope" itemtype="https://schema.org/ImageObject"><ul class="avia-slideshow-inner" style="padding: 0px;"><li class="av-single-slide slide-1  active-slide" style="visibility: visible; opacity: 1; transition: none; transform: translateZ(0px);"><div data-rel="slideshow-2" class="avia-slide-wrap"><div class="caption_fullwidth av-slideshow-caption caption_bottom"><div class="container caption_container"><div class="slideshow_caption"><div class="slideshow_inner_caption"><div class="slideshow_align_caption"><a href="http://gccre.com.au/contact/" class="avia-slideshow-button avia-button avia-color-black " data-duration="800" data-easing="easeInOutQuad">contact us</a></div></div></div></div></div><img src="http://gccre.com.au/wp-content/uploads/2018/04/bottom-final.jpg" width="2000" height="377" title="bottom-final" alt="" itemprop="thumbnailUrl" style="left: 0px;"></div></li></ul></div></div>