Custom modules and the Web IDE

I have just moved from the Chrome Web App to using https://www.espruino.com/ide/ and I can't load my custom modules.

I have added to "Settings > Communications > Module URL" however on upload the modules are not found and the console reports:

Loading modules loadModule(QMC5883L) ERROR: getURL("https://www.espruino.com/modules/QMC5883L.min.js") error :
HTTP 404 ERROR: getURL("https://www.espruino.com/modules/QMC5883L.js")
error : HTTP 404 ERROR:
getURL("file:///Users/will/working/espruino/modules/QMC5883L.min.js")
error [object ProgressEvent] ERROR:
getURL("file:///Users/will/working/espruino/modules/QMC5883L.js")
error [object ProgressEvent] WARNING: [notify_warn] Module QMC5883L
not found

I have also tried from an https:// address and get the same error. The URL, both file: and https:, are working from another tab in the same brower (Chrome on MacOS).

Anyone know what I am doing wrong?