Hi Alexander,
Here are some conversion that succeeded but in QGIS is not same.
Gpx → Osm
https://app.screencast.com/9BYewaRMFc1SG
Gpx → Gml
https://app.screencast.com/1RsdoDrcUmN3f
Gpx → Gpx
https://app.screencast…...problems in specifix input Aspose.GIS Product Family Alexander...TopoJSON format does not support 3D geometry, but input Gpx is MultiLineStringZ...