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and if nothing then you can down it and try following caddy reverse proxy guide and then that nextcloud guide. While maybe ditching portainer and just ssh in there and create files, run commands.
And I get this error accessing it directly at https://IPADDRESS:3902 or behind my NGINX reverse proxy giving it a domain name, a Let's Encrypt SSL, and following the instructions at https://github.com/nextcloud/all-in-one/blob/main/reverse-proxy.md
They also have 2 different docker-compose examples at https://hub.docker.com/_/nextcloud