Now, I not change ROOT_URL with default value --> I need change it to my nas IP?Well done!
Regarding accessing it you need to use the URL that you have defined in your
ROOT_URLvariable in Docker.
If you haven't changed the parameter then it will expect access on localhost:3000 as the image presents. But ofc that will not work as localhost will in your case mean the device you are accessing it from, and there is no RC instance there.
What did you configure your