I have done some efforts (Send to SD e.g., app from Google Play) and Garmin Exchanger: no result. My Dakota is recognised a mass storage, SD. One can transport a photo from the Gallary to the Dakota, but not .gpx (with Send to SD appl.).
I am empty with ideas, saw something like this on the web: I felt free to jump in and put my question here, may be someone recognises my wish.