Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/commits/commit/52d8beac5b6dae31e54c6d084e1feff9df7be1a2/doc/images/manual-images/Preset_Long_Press.png You should set ROOT_URL correctly, otherwise the web may not work correctly.