#1. First, you need to find the Portfolio item URL.

In my example, we will have:

• /portfolio01/project-one-ephnc-ra6kt
• /portfolio01/project-two-llrgk-y6r72
• /portfolio01/project-three-8zgh7-cw24f
• /portfolio01/project-four-yjynj-3ft5b
• /portfolio01/project-five-jkmzy-8756a

#2. Install Lightbox Plugin, plugin will give you some code to add to Code Injection Header/Footer, like this.

#3. Create a Page in Not Linked with Name/URL:

• Lightbox Video – /lightbox-video

#4. Add some Video Blocks to this Lightbox Video Page

#5. Install Squarespace ID Finder and find the ID of these Video Blocks. In my example, we will have:

• Video 01: #block-yui_3_17_2_1_1717469864332_4134
• Video 02: #block-yui_3_17_2_1_1717469864332_3425
• Video 03: #block-yui_3_17_2_1_1717469864332_2864

#6. Use this code to Code Injection – Footer, above Plugin code

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.0/jquery.min.js"></script>
<script>
  $('.grid-item[href="/portfolio01/project-one-ephnc-ra6kt"]').attr('href','#wm-popup=/lightbox-video#block-yui_3_17_2_1_1717469864332_4134');
  	$('.grid-item[href="/portfolio01/project-two-llrgk-y6r72"]').attr('href','#wm-popup=/lightbox-video#block-yui_3_17_2_1_1717469864332_3425');
 	 $('.grid-item[href="/portfolio01/project-three-8zgh7-cw24f"]').attr('href','#wm-popup=/lightbox-video#block-yui_3_17_2_1_1717469864332_2864');
</script>

#7. Result.

When clicking an item on the Portfolio Page, a Video Lightbox will appear.