GPX Viewer

Hi,
I wanted to add WMS map to GPX Viwer Pro, but was unable to add and show WMS map correctly.

For example, I try to add a WMS link https://wxs.ign.fr/administratif/geoportail/r/wms. It seems that the app can't retrieve information of server correctly when the protocal is HTTPS but after I changed to HTTP it can. However, it can't retrieve WMS map tiles no matter with what image type, image size and layers I provided.