Umbraco-CMS/src/Umbraco.Web.UI/config/FileSystemProviders.Release.config

<?xml version="1.0"?>
<FileSystemProviders>
  
  <!-- Media -->
  <Provider alias="media" type="Umbraco.Core.IO.PhysicalFileSystem, Umbraco.Core">
    <Parameters>
      <add key="virtualRoot" value="~/media/" />
    </Parameters>
  </Provider>
   
</FileSystemProviders>