I've uploaded a sketch from the Arduino IDE to my (Amica) esp8266-12e board with the sketch data upload tool (ESP8266FS). This goes without any errors or problems. However, the code is never executed, it's like that the code isn't even on the board, it does nothing. I've tried flashing the firmware several times but this does not help. Depending on the installed firmware I get different messages on the serial monitor such as
NodeMCU 0.9.5 build 20150318 powered by Lua 5.1.4 lua: cannot open init.lua
Ai-Thinker Technology Co.,Ltd. invalid
So installing different kinds of firmware is not the problem here. What did I do wrong which causes the board to 'ignore' the uploaded data sketch?