Make sure you have a microSD card that’s compatible with Nintendo Switch.
Nintendo’s console only supports microSD cards up to 2GB in size, microSDHC cards between 4GB and 32GB in size, and microSDXC cards with sizes 64GB and up.
Why won’t my SD card work on my Nintendo switch?
Verify that the microSD card is compatible with Nintendo Switch. If the microSD card is not compatible with the console, replacing it with a compatible type may resolve the problem. Then power on Nintendo Switch and be sure to perform a system update.
Does Nintendo switch support exFat?
To save costs, the Switch doesn’t come with the driver for exFat support and instead prompts you to download that the first time you plug in an exFat formatted card. Oddly, Nintendo did a bad job with their exFat driver, so the Switch can sometimes corrupt exFat cards.
Will any memory card work with switch?
The Switch is compatible with SDXC cards, which is backwards compatible with the older, smaller capacity SD and SDHC cards. So pretty much any microSD card you’ve got lying around from an old Android phone or a digital camera should work in the Switch.