Is there an option to display kml or gpx files by uploading it to the files section and starting the maps app?

There is a plug in for leaflet that should allow both file types. See: http://psha.org.ru/b/leaflet-plugins.html

An advanced option would be to allow selecting layers of multiple kml and gpx files to be displayed the same time, but for now a simple show kml from the files app would do.

Thanks!