Hi there. I've already read all the other posts with similar issue but I think my problem is a bit different.
Installed Pi-hole on container using Portainer (I don't know how to show you the docker-compose.yml file because I don't know if it even exists afer insalling through Portainer).
Pihole is working like a charm since last couple of months. I do access the GUI, I already updated Gravity database and it's blocking currently 19.8% of requests, so all is working fine.