If you want to share a volume with Jupyterlab, this is unfortunately not enough. Each user gets their own Jupyterlab container from a notebook image. By default, this is jupyter/datascience-notebook. However, no media group is created in this container. There is also no user cloudron.
Since I created my own image, I could simply create the group media and add the user Jovyan. Now it works.
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nigeil
@nigeil