addGroundOverlay from Google Maps Native not working

Hi all!

I am having some difficulties trying to add an overlay on Google Maps.

this.map.addGroundOverlay({
            'url': floorplan.url,
            'bounds': bounds,
            'visible': true,
            'opacity': 1,
            'zIndex': 9999
        }).then(
            (result) => {
                console.log('success', result);
            },
            (error) => {
                console.log('error', error);
            }
        );

I am also using IndoorAtlas cordova plugin. When I try adding the floorplan image on the google maps, nothing happens.
If I use the google maps javascript api and not the ionic-native version, everything works perfectly, but I want to use the native version because it does have much more features as geolocating in real time and so on.

Please help me.
Thank you!