I have a Nintendo Switch, a Micro SDHC 32GB with save files on it, and a Micro SDXC 64GB that I'd like to transfer the files to.
As per this Nintendo FAQ, both cards are Switch-compatible. I have already downloaded the necessary Switch update.
If I plug the SDXC into my Switch when the card is empty, the Switch has no problem reading it.
If I format the SDXC when it's in my Switch, the formatting process completes successfully.
If I format the SDXC on my computer to ExFAT or FAT32, the Switch has no problem reading it.
But the second I copy all the data from the SDHC onto the SDXC, carefully following the advice from this other Nintendo FAQ, the Switch starts screaming bloody murder about how it can't read the SD card that's been imported.
I've tried copying the data directly from one card to the other (my adapter supports two SD cards simultaneously). I've tried copying the data to my computer, then to the second card. I've tried doing all this on my Mac, on my Virtual Windows, and on my actual Windows. I've tried overwriting the folders automatically placed on the SD card when the Switch formats it, and I've tried merging them instead. No matter what I try the Switch doesn't like the new card.
How can I transfer the data between the two SD cards?