I dont use the Docker version but can you open a bash shell in your Docker container using the command
docker exec -it <container_name> /bin/bash
and post the output of the following command?
ls -l /opt/xibo
Also, could you check if the web server user (like www-data, apache, or a dedicated user) has ownership of the library directory? This is crucial for Xibo to function correctly.
If the ownership isn’t set correctly, you can change it with this command (adjust the path if necessary):
chown -R www-data:www-data /opt/xibo
If this doesn’t resolve the issue, could you share the log files?