Hi. Mass storage device
USB memory stick
There are libraries out there that when a seed s3 sense is connectted to an SD card, it will appear in windows Explorer as an external USB drive
These libraries are not for the Seeed S3 Sense so the pin mapping is different
CS is straightforward as the Seeed sense says the CS is GPIO21
SPI MISO, MOSI and CLK are default
Another define is labelled as SS but i cant find this on the Sense