Configuration.yaml HA on docker/synology

I am rather new to HA, adding some integrations but now started with editing the configuration.yaml

I use Visual code to access the file on my Synology, editing works like expected but nothing works. It seems that after restarting the file is not loaded. I searched the forum and internet but without any solution. Does anybody has a good hint, or solution?

Many thanks.

Difficult guessing as unclear how you installed it.
Have a look below

Side note and am not (!) sure if still the case, in the past (2y ago) there were issues to connect to the usb (e.g. for antennas zigbee/etc. )...there was a workaround somewhere but I left syno long ago so no longer sure if/what/where

How to Install Home Assistant on Your Synology NAS – Marius Hosting

It still works!

Make sure that the configuration.yaml is stored outside the container. Have you mapped /config to a folder on your NAS in the docker setup?