I would also take a look at esp32 and possibly raspberry pi pico W as well. For the esp32 there is this official example of what I think is faking a usb drive:

I would also take a look at esp32 and possibly raspberry pi pico W as well. For the esp32 there is this official example of what I think is faking a usb drive: https://github.com/espressif/arduino-esp32/blob/master/libraries/USB/examples/USBMSC/USBMSC.ino https://github.com/espressif/arduino-esp32/blob/master/libra... Not all ESP32s support USB OTG and I don’t have the correct one here atm to test with. Not sure how much more work would be needed to serve files from sd card. You could then use a web server on the esp32 to transfer your files