Image not showing on mobile version Unique Headers

Hi, I am using Unique Headers plugin for a friend. It works great on PC version. I am ready to go live, but when viewing and testing the mobile version I cannot see the image displaying on the top. Everything else on the website displays great except no Image on the top I have a unique header image on each page. What is the best way to display this ? I know where to put the coding, and I am used to adding in coding for Metaslider to display but would like to know how to add your Unique image to view on mobile also.

Coding I have used previously for Metaslider is:

<?php if( is_front_page() ) {
echo do_shortcode(“[metaslider id=224]”); }
?>

Therefore I assume I just have to replace the shortcode above with something relevant to Unique Headers plugin ?

So therefore I just need to know what coding to allow the Unique header on each page to display on the top of the mobile ? I have been googling but had no luck.

Thanks in advance. I know there will be people who have experienced this issue and would know the best way to fix it to allow to display on mobile.

Thx
Kristin