I wish to store a random sized string (say up to 20 characters but could be much shorter) so that it is available after the board has been switched of and on again. As the Uno R4 WiFi contains a built-in ESP32 I assume that spiffs could be used for this purpose (or LittleFS) or eeprom.
Which method would be recommended for the Uno R4 WiFi?
Normally, user Uno R4 WiFi code runs on the board's Renesas RA4M1 ARM processor. The ESP32 runs fixed code implementing a WiFi Modem, among other things. You can write your own code for the ESP32, but that's an advanced procedure. So, the ESP32's LittleFS is nominally out of your reach.
EEPROM functionality is simulated with flash on the main ARM processor. Use that:
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