I followed the instructions here: https://github.com/esp8266/Arduino/blob/esp8266/hardware/esp8266com/esp8266/doc/reference.md#uploading-files-to-file-system When I hit the "ESP8266 Sketch Data Upload" menu item, I get an error saying "SPIFFS Error: mkspiffs not found!" Not sure why that is. If there's any additional info I can provide please let me know. I'm on Mac OSX, if that helps. Thanks for the great work!