Hi, I was wondering the same thing and took a chance today and installed this card:

This micro SD card is 100% compatible with the Nintendo Switch OLED. 👍🏻

Even more; it loads and reads the games almost twice as fast as the console itself - immediately moved all games to the card.

And it has 15 x as much space as the Switch's 64GB.

I can only recommend this product to you.

I hope this was helpful for you.

That depends on the operating system. With open operating systems like Windows, it's never a question. Even in an Android phone, the card works. With a Nintendo, it might work, but they've never tested it. You'll probably have to borrow one of those cards and try it.