Geoboater, Cachly will import GPX files from GSAK with no problem. I had a similar issue with GPX export from BaseCamp, and found that if I loaded a BaseCamp export into GSAK and resaved it, Cachly imported it with no trouble. To add further praise to Cachly, I sent a Garmin BaseCamp GPX file to the developer and the next Cachly update would directly import a BaseCamp GPX without having to go through GSAK first.