title: Azure DevOps build pipeline does not include all NuGet package content files
body: <p>I'm busy creating a Azure Devops build pipeline for a ASP.NET MVC application, but I'm stuck on restoring some NuGet packages.</p>
  
  <p>I decided to add all folders to the .gitignore file that are added by NuGet package installs. Because pipelines will reproduce this files when doing a NuGet restore.</p>
  
  <p>Unfortunately , for one of my installed NuGet-packages this doesn't work: the expected files were not added to my artifact.</p>
  
  <p>When I install this package manually in Visual Studio, NuGet will add an assembly and some files inside the App_Plugins/uSync folder, but the NuGet restore step in Pipelines does not: it only added the assembly to the final artifact. The App_Plugins files are missing.</p>
  
  <p>Below my YAML representation of the build pipeline:</p>
  
  <pre><code>steps:
  - task: NuGetToolInstaller@1
  
  - task: NuGetCommand@2
    inputs:
      restoreSolution: '$(solution)'
  
  - task: VSBuild@1
    inputs:
      solution: '$(solution)'
      msbuildArgs: '/p:DeployOnBuild=true /p:WebPublishMethod=Package /p:PackageAsSingleFile=true /p:SkipInvalidConfigurations=true /p:PackageLocation="$(build.artifactStagingDirectory)"'
      platform: '$(buildPlatform)'
      configuration: '$(buildConfiguration)'
  
  - task: PublishBuildArtifacts@1
    inputs:
      PathtoPublish: '$(Build.ArtifactStagingDirectory)'
      ArtifactName: 'artifact'
      publishLocation: 'Container'
  </code></pre>
  
  <p>Any help much appreciated!</p>