How to upload files to a SD card, to be read by the ESP32.
ESP32 reading file from SD card
How to connect the ESP32 to a SD card and read a file from it.
ESP32 writing file to SD card
How to connect the ESP32 to a SD card and write a file to it.
ESP32: connecting to SD Card
How to interact with a SD card from the ESP32, using the Arduino core.