I have a doubt who helps me?

I have a ssd samsung internal with a playlist named mashup, which every now and then I update with new songs, then I have a USB key, with the same playlists, now when I insert the USB key I get this message, I would like to know if I press which of the two devices will it be updated? in addition if I press no in the ssd some playlists disappear, to get them back I have to change from internal ssd to usb a couple of times and then everything returns to normal, so what happens if I press yes?

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