I'm looking for a beginner's guide to setting up external flash on the nRF9161 DK. I saw nRF Cloud Multi-service as an example, but its docs did not explain what was needed hardware-wise to set up the external flash memory (I found this). Basically, I have a spare Adafruit SPI Flash SD Card XTSD 4GB, and I'm looking to connect it to the DK if possible. I assume I need to modify the board overlay but I'm not sure where to go from here. Where are the pins for gd25wb256 in the sample defined?
