C# .NET 7 Include and load resources with .csproj

Question

I am trying to include resources via csproj file to a C# .NET 7 app and then use them (get a byte array or something), there are some resources online to this but none of them worked for me and many of them were outdated. I made some code how it probably like but all load resource functions I tried couldn't find a resource. (No errors or warnings)

dotnet publish -r win-x86 -c Release --self-contained true /p:PublishSingleFile=true 

.cs

using System.Reflection;
using System.IO;

namespace Program{
    class Program{
        static void Main(){
                    GetRes("Program.Build2.png");
        }

        public static byte[] GetRes(string resName)
                {
                    var assembly = typeof(MyLibrary.MyClass).GetTypeInfo().Assembly;
                    Stream resource = assembly.GetManifestResourceStream(resName);
                    return StreamToByteArray(resource);
        }

                public static byte[] StreamToByteArray(Stream input)
                {
                    using (MemoryStream ms = new MemoryStream())
                    {
                        input.CopyTo(ms);
                        return ms.ToArray();
                    }
                }
    }
}

.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net7.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <EmbeddedResource Include="this.txt" />
  </ItemGroup>
  <ItemGroup>
    <EmbeddedResource Include="Build2.png" />
  </ItemGroup>

</Project>

I wanted to load resources but the functions I tried always returned null.