Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/commits/commit/15a39283c84f6d0eebcda456705565992fb603b6/doc/manuals/MicroDexed-User_Manual/images/10_SaveVoice_1.jpg You should set ROOT_URL correctly, otherwise the web may not work correctly.