Cómo cargar un informe en OnlineDesigner y descargarlo después de editar en una aplicación ASP .Net Core

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public class Startup
{
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
 {
…
 app.UseFastReport();
 …
}
}

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 public class HomeController : Controller
 {
 
 public static string ReportName;
 
public ActionResult Index(string filepath)
 {
 Task.WaitAll();
 WebReport webReport = new WebReport(); // Web report object
 webReport.Width = "1000";
 webReport.Height = "1000";
 string report_path = GetReportPath(); // Path to the folder with reports
 System.Data.DataSet dataSet = new System.Data.DataSet();
 dataSet.ReadXml(report_path + "nwind.xml"); // Read the database
 webReport.Report.RegisterData(dataSet, "NorthWind"); // Register data in the report
 if (System.IO.File.Exists(report_path + "report.frx"))
 {
 webReport.Report.Load(report_path + "report.frx");
 }
 // If you use a cache, then load a report from it.
 if (filepath != null)
 {
 webReport.Report.Load(filepath);
 }
 
 // Set the settings Online-Designer
 webReport.Mode = WebReportMode.Designer;
 webReport.DesignScriptCode = false;
 webReport.Debug = true;
 webReport.DesignerPath = @"WebReportDesigner/index.html"; 
 webReport.DesignerSaveCallBack = "Home/SaveDesignedReport";
 ViewBag.WebReport = webReport; // pass the report to View
 ViewData["reportName"] = ReportName = Path.GetFileName(filepath);
 return View();
 }
 private string GetReportPath()
 {
 return "wwwroot/App_Data/";
 }
 
 
 [HttpPost]
 public async Task<IActionResult> UploadFile(List<IFormFile> file)
 {
 if (file == null || file[0].Length == 0)
 return Content("file not selected");
 // Form the path to the file
 var path = Path.Combine(
 Directory.GetCurrentDirectory(), GetReportPath(),
 file[0].FileName);
 // Save the file on the server
 using (var stream = new FileStream(path, FileMode.Create))
 {
 await file[0].CopyToAsync(stream);
 }
 // Move on to display the report designer with the loaded report template.
 return RedirectToAction("Index", "Home", new { filepath = path });
 }
 
 [HttpPost]
 public IActionResult Download(string filename)
 {
 // Form the path to the file on the server
 var path = Path.Combine(Directory.GetCurrentDirectory(), GetReportPath(), filename);
 
 if (System.IO.File.Exists(path))
 {
 // Form the result of POST request
 var bytes = System.IO.File.ReadAllBytes(path);
 Response.Body.Write(bytes, 0, bytes.Length);
 }
 return new OkResult();
 } 
 
 
 [HttpPost] 
 public IActionResult SaveDesignedReport(string reportID, string reportUUID)
 {
 var path = Path.Combine(Directory.GetCurrentDirectory(), GetReportPath());
 ViewBag.Message = String.Format("Confirmed {0} {1}", reportID, reportUUID); // Set the message for representation
 Stream reportForSave = Request.Body; // Write the result of the Post-request to the stream.
 string pathToSave = System.IO.Path.Combine(path, ReportName); // Form the path to save the file
 using (FileStream file = new FileStream(pathToSave, FileMode.Create)) // Stream creation
 {
 reportForSave.CopyTo(file); // Save query result to file
 return View();
 }
 }
 
 }