Packing a plugin library

I wanted to check that a packed library would work with the CAD application we were making a plugin for

so I got the demo and I was able to get the library file to compile, but I wasn’t able to get it packed

in options the “pack” option is greyed out, is there anything required before a library would be “Packable”

I haven’t been able to find any information as to why this would be the case

we wanted to ensure this would work before purchasing a license

We’re using C#.net 6

The packing feature is available for .NET Framework and isn’t available for .NET Core and .NET.