Yes, I may be able to help out, but it may take awhile. Will advise. Keep in mind, though, in order to edit gpx files, you'll likely need an internet connection. If your aim is to modify pre-planned gpx or tcx files on a tablet or phone while at a hotel during your travels, then this should work out nicely. I have done exactly that many times.
Last edited by sierrabob; 09-08-18 at 11:13 AM.
Reason: more detail