public void ConfigureServices(IServiceCollection services)
{
#pragma warning disable IDE0022 // Use expression body for methods
    services.AddUmbraco(_env, _config)
        .AddBackOffice()
        .AddWebsite()
        .AddComposers()
        // For Umbraco Cloud:
        .AddAzureBlobMediaFileSystem(options =>
        {
            options.ConnectionString = _config.GetValue("Umbraco:Storage:AzureBlob:Media:ConnectionString", "");
            options.ContainerName = _config.GetValue("Umbraco:Storage:AzureBlob:Media:ContainerName", "");
        })
        .Build();
#pragma warning restore IDE0022 // Use expression body for methods
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
  app.UseUmbraco()
  .WithMiddleware(u =>
  {
      u.UseBackOffice();
      u.UseWebsite();
      // For Umbraco Cloud:
      u.UseAzureBlobMediaFileSystem();
  })
  .WithEndpoints(u =>
  {
      u.UseInstallerEndpoints();
      u.UseBackOfficeEndpoints();
      u.UseWebsiteEndpoints();
      // For all sites:
      u.EndpointRouteBuilder.MapControllerRoute(
          "SecureMediaRoute",
          "secure/{id?}/{file?}",
          new { 
              controller = "SecureMedia",
              action = "Index"
          }
      );
  });
}