How can I modify media upload type in Dawn Theme?

Store Design
1

Hello, I’m currently using Dawn Theme to my Shopify store and there’s this section I want to upload a video instead of a image, but it seems like I can’t change the media type upload no matter what I try in the .liquid code. Is there any way to change it?

Here’s a link for the example: https://ibb.co/zQ1CNzR

2

Unfortunately I don’t have that option to change the theme, I have to use Dawn