I'm having trouble adding a thumbnail to a custom HTML I added. The code I used is below:
<video controls="controls" style="max-width: 100%; height: auto;">
<source src="https://cdn.shopify.com/s/files/(my video link is here)" type="video/mp4">" type="video/mp4">
I want to add an image that I have saved on my site so that the image is the first thing you see to press play instead of the black screen. PLEASE HELP!