@dsmtweaker
If your local content locates under MagicMirror and it’s sub directory, you can contact via http.
~/MagicMirror/YOUR_RESOURCE => http://localhost:8080/YOUR_RESOURCE
~/MagicMirror/modules/MMM-SOMETHING/SOMEWHERE/SOME => http://localhost:8080/modules/MMM-SOMETHING/SOMEWHERE/SOME
But other location… hmmm I’m not sure whether symbolic_link would work. If not so, you need another approach. - more complex… just to move your content under MagicMirror would be simpler.