G'day James,
Just wandered by, and spotted this thread. (How've you been?)
The "Fonts" folder on the Story lets you change the font to a custom choice in some of the auxiliary apps, like the notebook and calendar, but not in displaying ePubs.
To get a custom font in the ePub, you have to change the CSS to call that font (which you've done) but also embed the font file in TTF format within the ePub file itself.
Easiest way is to open the ePub file in Sigil. There'll be a Fonts folder already in the ePub structure. Copy the fonts in there (named the same as the reference in the CSS, obviously) and save the file, and you're away. ;-)
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