Uploading content through damLinkField ignores rootPath

Steps to reproduce

Add the following property to any dialog:

damLinkTest:
  label: Test label
  $type: damLinkField
  required: true
  datasource:
    $type: assetDatasource
    rootPath: "/travel-demo"
    workspace: dam 

Then access it, and upload an asset without selecting any folder at all (use direct upload with bottom-left actions, both upload and upload&edit suffers from this issue). This asset should be stored on "/travel-demo". However, it'll be stored on the root of the dam workspace instead of taking into account the specified rootPath property.