In this article, we are going to show you how to quickly show images themselves without first downloading the file.
Sample screenshots:-

Clicking on any image in the file/image upload element will bring up lightbox, displaying the photo.

In any form that contains Image Upload field, add a Custom HTML and put in the following code.

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/fancybox/3.5.7/jquery.fancybox.min.css" integrity="sha256-Vzbj7sDDS/woiFS3uNKo8eIuni59rjyNGtXfstRzStA=" crossorigin="anonymous" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/fancybox/3.5.7/jquery.fancybox.min.js" integrity="sha256-yt2kYMy0w8AbtF89WXb2P1rfjcP/HTHLT7097U8Y5b8=" crossorigin="anonymous"></script>

<script type="text/javascript">
$(function(){
// Init fancybox
$().fancybox({
selector : 'ul.form-fileupload-value > li > a:has(img)',
thumbs : {
autoStart : true
}
});
}); 
</script>

If you are using regular File Upload, you can use the code below to scan through images in them and display in lightbox too.

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/fancybox/3.5.7/jquery.fancybox.min.css" integrity="sha256-Vzbj7sDDS/woiFS3uNKo8eIuni59rjyNGtXfstRzStA=" crossorigin="anonymous" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/fancybox/3.5.7/jquery.fancybox.min.js" integrity="sha256-yt2kYMy0w8AbtF89WXb2P1rfjcP/HTHLT7097U8Y5b8=" crossorigin="anonymous"></script>
 
<script type="text/javascript">
$(function(){
    //locate images
    $("ul.form-fileupload-value > li > a").each( function(){
        if(/\.(?:jpg|jpeg|gif|png)$/i.test($(this).text())){
          $(this).addClass("withImage");
        }
    });
        
    // Init fancybox
    // selector : 'ul.form-fileupload-value > li > a:has(img)',
    $().fancybox({
        selector : 'ul.form-fileupload-value > li > a.withImage, ul.form-fileupload-value > li > a:has(img)',
        thumbs : {
        autoStart : true
        }
    });
}); 
</script>   
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