Saved the track with kurviger pro app (only gpx is possible) and try to open the file with kurviger.de. Kurviger.de says it is not possible to open this file only kurviger files.
Kurviger ask me if i think this is wrong - YES this is wrong !
could you please send an example.
As long you do not change anything on the exported file it should work properly.
May you can do a new try.
Sometimes the file went corrupt during the transfer from phone to computer.