Thank you for the app suggestion! I was able to at least put the files into the correct folders, but unfortunately, they don't show up in the selection list for either ringtones or notifications. I'm not sure if they need to be specific encoders to work, or if there's still just no way for it to access it on US models.
UPDATE: Correction! While they didn't show up in the lists for me at first, I rebooted my watch, and then they were available to use! This method does work, for both MP3 and OGG files!
This worked!! But for some reason not right away.. I almost gave up. But the last time of 15 restarts. The ringtone showed up in both my ringtone and notifications!!
i'm just happy you managed to get it to work ,, a good few have said now it does'nt show up straight away after the restart, even leaving the watch off over night...
but you've got it to work so happy days.....cheers for the feedback