How do I host raw geojson files on github like Metabase's US map: https://raw.githubusercontent.com/metabase/metabase/master/resources/frontend_client/app/assets/geojson/us-states.json
Mine keep coming up blank in the Metabase URL upload preview pane. The field data is there, the geojsons are valid, but the polygons and areas don't show up visually.