Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/uClock/src/commit/fc050434c2580bddc8e0055adb11305ad8ef1226/examples/AcidStepSequencer/acid_step_sequencer-protoboard-v001.png
You should set ROOT_URL correctly, otherwise the web may not work correctly.