Upload file to WenAPI using import ngx-file-drop

Client.html

     <div class="center" *ngIf="!processingUpload && job.currentStage == 1">
            <file-drop headertext="Drop scrape database here" (onFileDrop)="uploadFile($event)">
            </file-drop>
        </div>

client.ts

  public uploadFile(event) {
    this.processingUpload = true;
    let formData = new FormData();

    for (let i = 0; i < event.files.length; i++) {
      event.files[i].fileEntry.file(file => {
        formData.append("files", file, event.files[i].relativePath);
        if (i === event.files.length - 1) {
          this.http
            .post(`/api/jobs/${this.id}/uploadfiles`, formData)
            .subscribe(
              res => {
                console.log("Import Complete");
                this.alert(
                  "success",
                  "<strong>Import Complete</strong> You can now begin preparing data for sync"
                );
                this.cd.detectChanges(); // changing a value via .subscribe()does not notify that it should run changedetection.
              },
              err => {
                this.alert(
                  "danger",
                  "<strong>Upload Failed</strong> Check error logs for details."
                );
                console.log(err);
                this.cd.detectChanges();
              }
            );
        }
      });
    }
  }

Server.cs

  [HttpPost("{id}/UploadFiles")]
        [RequestSizeLimit(100_000_000)]
        public async Task<IActionResult> Post(int id, List<IFormFile> files)
        {
            try
            {
                var formFile = files?.First();

                if (formFile == null || formFile?.Length == 0)
                    return this.BadRequest();

                var filePath = _hostingEnvironment.ContentRootPath + Constants.ScrapeFolder;
                var fileName = $"Job-{id}{Path.GetExtension(formFile.FileName)}";

                Console.WriteLine("Writing file " + filePath + fileName);

                using (var stream = new FileStream(Path.Combine(filePath, fileName), FileMode.Create))
                    await formFile.CopyToAsync(stream);

                var existing = await _db.Jobs.FindAsync(id);

                existing.DataFile = fileName;

                await _importer.Import(ImportConfig.Setup(id, fileName, existing.NullSkus, existing.BrandMatch));

                existing.Status = JobStatus.DataImported;
                existing.CurrentStage = 2;

                await _db.SaveChangesAsync();

                return Ok();
            }
            catch (Exception ex)
            {
                return BadRequest(ex.Message);
            }
        }