"Books.name" would not be a hidden folder. If you want a hidden .Books folder you would, in windows, name the folder .Books. then you would have a .Books folder, that would be hidden.
That would indicate that Nickel is not having a problem processing files on your external uSD card, now. It might mean that the card was not seating properly before. So it looks like the test would not have been needed, even if you had made the hidden folder properly.
Luck;
Ken
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