This is a self ask and answer article, hoping to benefit somebody else.
I have an iPhone app and want to enable it for both iPads and iPhones (as a Universal app). I've updated the app general app drop down menu to set my app as Universal app, but the Asset catalog only specifies iPhone icons.
I search for many suggestions here, including inserting the list via the Info.plist and event the alternative app icon API. Not really what I had in mind, and of course, they didn't work the way I had hoped.
How to get the iPad app icons to show in the Assets.xcassets?