Write file node in docker

Hey,

I just wanna write some kind of logfile using the write file node.
My installation is made in docker. So how can I achieve this goal?
It does not really matter where the file will appear on my raspberry pi file system...

You should have added a /data/ folder to your docker config, you can write to that.

where? here? I have no clue
If I add it here, where should the file appear? I cant find anything :frowning:

To your docker config (for the docker container). Running under Docker : Node-RED

In portainer I can see this. Is this the prerequisite?

THank you, it's working now!