How big is the card? I would probably say you bought a fakeEbay
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Never buy memory cards on eBay, it's littered with fakes (cards that have a real capacity lower than what's advertised and when you try to fill up the card anything beyond the real capacity gets corrupted)Ebay
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How much did it cost? Do you have a URL to the eBay listing?64gb samsung evo plus.ty
Switch supports both FAT32 and ExFAT, so that's not it.This is the sd card maybe its not the right format.