Hi! Thank you for your fast reply.
I have tried multiple times (now, again) to use this configuration. It is, however, not working.
My guess is that the configuration is not working because I am using TLJH (w/ repo2docker).
TLJH’s configuration file is in /opt/tljh/config/jupyterhub_config.d/jupyter_config.py and all other configurations stored in it work.
# Allow access to hidden files
c.ContentsManager.allow_hidden = True