Locally downloaded track not playing with 'play when possible'

[abookish]

Hi folks, I'm using Harlowe Audio Library to try and add a background track, and am having trouble getting the track to play.

What I'm noticing:
No sound when I click the link, and I'm getting these warnings in my browser console
All candidate resources failed to load. Media load paused. 1ec52ab6-712c-43f5-b590-e526df1da9cf.html
Source map error: Error: NetworkError when attempting to fetch resource.
Resource URL: file:///C:/Users/zephy/AppData/Local/Temp/1ec52ab6-712c-43f5-b590-e526df1da9cf.html
Source Map URL: es6-shim.map

How I'm using HAL:
I have a passage named hal.tracks
where I define my track this way: facingIt: "C:\Users\zephy\OneDrive\Documents\KomikuFacing it.mp3"

I am calling the track macro this way
(link:"and all we need")[(track: 'facingIt', 'playwhenpossible')(goto: 'Intro')]

Some version info:
-browser: Firefox 112.0.2 (64-bit)
-twine version: 2.6.2, used on Windows
-story version: Harlowe 3.3.5