[ciotóg]

I was using a SAMSUNG EVO Plus Micro SDXC 512GB, which was not working.
I have switched to a SABRENT Rocket V60 512GB SD, which seems to have indexed my whole library correctly (though the SD card cover did bend the SD card a very scary amount). Time will tell if it plays things nicely!

Is the Sabrent still playing nice for you? I need to pick up a card for mine in the 256GB - 512GB range and it seems to have been a very mixed bag for folks