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Felix,
thanks for your fast reply. I had checked if Spotlight sees the folders, and it does. The Video_TS folders are on an external drive which is permanently on.
What remains a mystery to me is that Remote Buddy once saw the folders, but now refuses to find them.
I will reinstall Remote Buddy, do a restart (again) and see and report what happens. If, in the meantime, you have advice, please let me know!
Best regards for now,
Camille