I need every product page in my Shopify store to feature a short product-demo video that sits inside the existing image gallery, showing up as an additional thumbnail just like the photos. When customers click that thumbnail, the video should play in the same lightbox or media area, so the shopping flow stays smooth and native to Shopify. All videos will be provided in standard formats (MP4 preferred). Your task is to handle the theme edits—HTML, Liquid, CSS, and any JavaScript tweaks—so the embedding works responsively on desktop and mobile without slowing the page. I’m using a modern 2.0 theme, so please build the solution in a way that survives theme updates and can be toggled on/off from the Theme Customizer or a simple Metafield. Deliverables: • Updated theme files with clean, commented code • Instructions (or short Loom) showing how I can add or swap videos for future products • Quick sanity check across the latest versions of Chrome, Safari, and mobile browsers to confirm playback If you’ve implemented inline video in Shopify galleries before and know your way around Liquid sections/blocks, this will be a straightforward job.