Ground Overlays

Hi

I just starting using this plugin and am having trouble doing a ground overlay from a KML file. First question is are ground overlays supported?

If so, then here is the shortcode I am using:
[flexiblemap src=”http://dweatherdt.com/KML_FILES/KML_BCLH_images/KML_BCLH.kml” width=”100%” height=”550px” zoom=”4″ center=”37.0,-95.0″]

Right now all that is appearing is a regular google map with nothing overlayed.
Any help would be appreciated and thanks for this easy to implement plugin!

-ABT

https://ww.wp.xz.cn/plugins/wp-flexible-map/