Hi,

yes by default Umbraco is using the default settings here, so looking for command line, envrionmental variables and then the files.

you can add the machine one if you want in program.cs

adding

       .ConfigureAppConfiguration(config => {
                config.AddJsonFile($"appsettings.{Environment.MachineName}.json", optional: true);
        })

seems to work, this would then be after the ConfigureUmbracoDefaults() section For example:

    public static IHostBuilder CreateHostBuilder(string[] args) =>
        Host.CreateDefaultBuilder(args)
            .ConfigureUmbracoDefaults()
            .ConfigureAppConfiguration(config => {
                config.AddJsonFile($"appsettings.{Environment.MachineName}.json", optional: true);
            })
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.UseStaticWebAssets();
                webBuilder.UseStartup<Startup>();
            });

I am not sure what impact this might have on upgrades, so its worth making sure you check when you do upgrade, but in general you can make changes to these files between major versions with no issues (and usually major versions too).