Gotcha, well glad you found it at least. Yeah Google is not be best friend for discuss, guessing not enough external links to it.
convertUris can actually be used for it with asset://asset-identifier, however usually not the easiest way.
A great tip is to look more at the source code of the core and the demo site, don’t be afraid to dive in, you’ll learn a lot and it’s neatly structured and not a big mess like other source codes sometimes are.