Thank you for your suggestion, I have re-implemented the website from scratch and added that to the future version.
At least now you can copy/paste/duplicate waypoints from one file to another. Maybe that is what you meant because waypoints are never associated to a specific segment inside a file.
You can check that out here: https://gpx.studio/gpx.studio/ and provide feedback on this new repository: https://github.com/gpxstudio/gpx.studio.
Thank you for your suggestion, I have re-implemented the website from scratch and added that to the future version. At least now you can copy/paste/duplicate waypoints from one file to another. Maybe that is what you meant because waypoints are never associated to a specific segment inside a file. You can check that out here: https://gpx.studio/gpx.studio/ and provide feedback on this new repository: https://github.com/gpxstudio/gpx.studio.