Azure blob files not showing in Kentico media library on Azure App

I have latest Kentico application + .NET Core MVC. Both solutions are setup to use Azure Blob Storage as media library. That is the code both uses:

protected override void OnInit()
{
    base.OnInit();

    // Creates a new StorageProvider instance for Azure
    var mediaProvider = StorageProvider.CreateAzureStorageProvider();

    // Specifies the target container
    mediaProvider.CustomRootPath = "media";

    //// Makes the container publicly accessible
    mediaProvider.PublicExternalFolderObject = true;

    // Maps a directory to the provider
    StorageHelper.MapStoragePath("~/Test/media/", mediaProvider);
}

For some reason it works on my local machine but when I released it to Azure, then when I open media library I can only see "FolderTree.FailedLoad: Could not find file 'D:\home\site\wwwroot\Test'." in the column where I should see folders tree.

I reviewd documentation and I can't see what's wrong so far.

Any idea?