We are trying to modify our site so that we can feature a full width image at the top of our collection pages. We have been able to do this by pulling in the featured image as the banner at the top of the page. The only issue is that we are also using the featured image to highlight a featured image in our mega menu and the dimensions are completely different. Am I able to full an image from somewhere else to feature in the mega menu or as the full width banner on the page? Is there a way to customise the admin area of Shopify so you can have two feature images?