You can upload more than one images in products. You can also add a primary image and video (YouTube/Vimeo) in products. To upload images and videos in products follow these below steps:
Click on the new button to create new product. Create a product. Product creation process you can know from here. How to create a product?
You can upload Primary image and video URL from the basic information of the product. A product can have only one primary image.
To use the videos in product, paste the URL of YouTube or Vimeo in Video URL section.