I agree with making the store front a little more browser friendly, especially on mobile. I've been upgrading some of my digital to physical copies and have more than once accidentally reordered duplicate copies (thank you Ben, for putting fixing those).
I know I can look at my shelf, but some digital->physical upgrades are bundled with preorders I've made and unless I click through every order to make sure it can be easy to miss.
Amazon has a notification at the top of every product page that says "You purchased this item on [PURCHASE DATE]" for items I've already bought. Perhaps the store front can have somethign similar followed by [DIGITAL] or [PHYSICAL] if applicable to let me know.