In a yml step template I’m using the DownloadPipelineArtifact@2 to download a specific artifact produced from my build pipeline.

Since the artifact is quite big and, depending on the cases, I don’t need all the whole artifact content, I’m providing the itemPattern property as input parameter to my step template and passing as it is to the DownloadPipelineArtifact@2 task to perform some filtering operations and speed up the build.

Below a simplified version of the step template I’ve implemented, called filteredDownloadArtifact:

parameters:
workingDirectoryTestPattern: '**'

steps:
- task: DownloadPipelineArtifact@2
  displayName: 'Download artifact'
  inputs:
    buildType: 'current'
    artifactName: 'MyArtifact'
    itemPattern: |
       ${{ parameters.workingDirectoryTestPattern }}

It seems it’s working fine when I provide just one pattern but I’m experiencing some issue when I provided multiple item patterns to be downloaded.

For example, in another yml step template I’ve a pwsh task used to determine which folders should be downloaded

- powershell: |
     $workingDirectoryTestPattern  = (("$(fileCollection)" -split ' ') | ForEach-Object {
        $dllName = [System.IO.Path]::GetFileName($_)
        $_.replace($dllName, '**')
      })  -join "`r`n"
      
      Write-Host "##vso[task.setvariable variable=_workingDirectoryTestPattern]$workingDirectoryTestPattern"

and then I consume the filteredDownloadArtifact this way:

- template: filteredDownloadArtifact.yml
  parameters:
    workingDirectoryTestPattern: |
      $(_workingDirectoryTestPattern)

But it doesn’t seem to work. Only one item pattern is provided to my step template.

So, is there a different way to consume multiline parameters when passed to an Azure DevOps step template? Thanks