There is a note about the ESP32 devices with internal embedded flash:

"The pin-pin mapping between ESP32-D2WD and the embedded flash is as follows: GPIO16 = CS#, GPIO17 =
IO1/DO, SD_CMD = IO3/HOLD#, SD_CLK = CLK, SD_DATA_0 = IO2/WP#, SD_DATA_1 = IO0/DI. The pins used
for embedded flash are not ...