Problems with remote access

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Under volumes, you could map both /config and /data to specific folders. That's what the volumes area is for. The environment area is to set specific variables (defaults are already set for some in your image) the image uses during setup.

If you don't map /config and /data to specific folders, you will likely lose your data when restarting the image.

Here's a little more info from Caddy's site: https://caddyserver.com/docs/running#docker-compose

There's not likely to be much Synology specific from an official source, but the docker compose setup should translate pretty nicely to the interface you're using.