How do I load things from the filesystem?

So... I'd like my users to be able to make a spellbook that is a HTML page (with some special tags to do the Unity interactions)...

I have https://github.com/TLabAltoh/TLabWebView   working (Do NOT enable Legacy Graphics Jobs!), but... it seems Q3 really likes loading things from https servers, not the local filesystem.

I figured it was player data so...?

But... I get Cleartext Denied when I try to load something from the file:/// url.