bluetooth between pc and gear s2: not file transfer possilbe

hi everyone
the bluetooth setup and verification worked fine on both sides, i.e. surface 4 and gear s2. after selecting a file for transfer towards my gear s2, the transfer doesn't occur.
i have been spending a lot of time lately to figure out how i can load some music files to my new watch.

any ideas how i can proceed? unfortunately, the gear-app on my galaxy is not showing any music files so this obvious solution doesn't work for me.

thanks in advance for any advice.
helpmarcy

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