SourceLink for Library created using Visual Studio

I followed the procedure mentioned in that link.

My source is TFS:
Class Library .Net Framework: 4.5.2

I included below set of code in my .csproj file

```

netcoreapp2.1

true

true

true
snupkg

```

What is "VirutalDirectory" -> what should go in there?

When I deploy the package it creates .nupkg in a network location. should I publish the .pub file in same location?
How does it work?
Could you please help.

Should my package deployed somewhere else to get downloaded?

Thanks for your help!