If you run the SD_Test example: https://github.com/espressif/arduino-esp32/blob/master/libraries/SD/examples/SD_Test/SD_Test.ino on a lolin d32 pro https://github.com/espressif/arduino-esp32/blob/master/variants/d32_pro/pins_arduino.h using the SD card slot, it will fail with `Card Mount Failed`, because the SD library uses `SS` as the default slave/chip select, while the d32 has `TF_CS` defined for the slave select. In the example if you set the CS, it runs as expected. ```diff - if(!SD.begin()){ + if(!SD.begin(4)){ ``` I think the actual solution is to also define `SS` for the D32 pro?