don’t see the track

Good morning, i’m triyng to use your plugin, and i add KML flie generte from here: https://umap.openstreetmap.fr/

When i import in your plugin the KML file it works and i generate shortcode.
In the post i see exactly the map…but i don’t see the line over the road of the map…(in your example here: https://wp-osm-plugin.hanblog.net/examples/display-kml-file/) your line with the path it’s red.
If i try to upload your KML file (just like an example) i see on my post the red line over the path, but with my KML that i got from this site https://umap.openstreetmap.fr/ i don’t see any line over the path of the map.

Why? where i can get and export the right kml files (like yours?)
Thanks
Dave