I just tried to add a 128gb sd card to my Switch after starting off with a 32gb card. BUT, since I've been playing Breath of the Wild, the game was saving on the 32gb card and none of the data showed up when I had the new card in. I used my computer to copy and paste all the data from the 32gb card to the 128gb one, but I got an error screen when I tried to start Breath of the Wild. Back to the 32gb card for now until Nintendo let's us move data from the sd card to the console's memory.