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Did you use the example docker-compose file? https://github.com/apache/druid/blob/26.0.0/distribution/docker/docker-compose.yml

/opt/druid

path is created based on volume definitions described in the compose file.

Yes, I did. But I can’t find the folder. I wanted to load some sample data into Druid but it wouldn’t allow me to do it unless it was ‘visible’ to Druid.