Hi,
Thank you for your feedback.
Videos can be added in the "files" area of products.
This can allow you to provide the videos as downloads after the purchase of the product or via a download link on the product page.
You can also easily add a custom field of the type "text" and of the table "product" so that you can enter the URL of a youtube video and then use the "format" setting to generate the HTML for the display of the video area.
That way, you can enter the URL in each product, and it will appear on the right side of the product page automatically.
Plus, as I was saying 2 years ago here, the description can also be used to include video players.
So, there are already several ways to add videos to products in HikaShop.
The images mini gallery system on the left side of the product page was not made to support videos. Similarly, the image gallery selector in the backend wasn't made to support video either. So, while I can understand the interest for this, it's not something we can easily add, and many were fine with the alternatives already available, and thus we were working on other priorities. But we can add it to the todo list. I just can't say when we'll be able to look into it at the moment.