So glad to hear you're looking to make the most of your trial period!
I'd love to know more about what you're experiencing. What exactly happens when you try to add an image to the Media field on your admin's product page? Or are you specifically trying to assign images to specific product variants?
If you're comfortable doing so, please feel free to share any screenshots or descriptions of issues you're running into so I can better understand what is occurring on your end. If you'd like, you're welcome to review our Help Center docs for extra guidance: