I'm creating a custom Workflow in Umbraco Forms 10 where I create a PDF file and send it via email. I would also like to keep a backup in our Azure Blob storage account in a private container (outside of Umbraco media).

In Umbraco 7 I could easily add a new filesystem in FilesystemsProvider.config but I have some trouble with Umbraco 10.

I found a function AddAzureBlobFileSystem(string name) in https://github.com/umbraco/Umbraco.StorageProviders#usage-2 that might be useful:

Here's my Startup.cs:

public void ConfigureServices(IServiceCollection services)
{
    services.AddUmbraco(_env, _config)
        .AddBackOffice()
        .AddWebsite()
        .AddComposers()
        .AddAzureBlobMediaFileSystem()
        .AddAzureBlobFileSystem("Enrollments") // <------
        .Build();
}

How do I retrieve this new filesystem in my workflow? I tried using IAzureBlobFileSystemProvider in the constructor, but it contains only the Media filesystem.

public class PdfWorkflow : WorkflowType
{
    private readonly IAzureBlobFileSystem _blobFileSystem;

    public PdfWorkflow(IAzureBlobFileSystemProvider provider)
    {
        _blobFileSystem = provider.GetFileSystem("Enrollments");
    }
}