Rich Text Editor Component plugin issue

hi all,

We have just deploy the plugin into our local ENV Appian 19.2

when testing the plugin, it says "This component requires the dynamic content domain to be properly configured. Contact your system administrator."

Based on Appian Doc,

A properly configured dynamic content URL is required to use component plug-ins. For local installations, follow these steps:

1. Create a dummy dynamic domain based on your site domain. For example, if your SERVER_AND_PORT property is local.example.com:8080, set DYNAMIC_SERVER_AND_PORT to local.example-dynamic.com:8080.
2. Add local.example-dynamic.com to /etc/hosts (or C:\Windows\System32\Drivers\etc\hosts) and map it to your local IP address

could you please confirm it's the right way to add the configuration? if not, could you please share your configuration. thanks.