public async Task <IActionResult> UploadCertificateAsync(int invoiceId, IFormFile file)
{
if (file == null || file.Length == 0)
{
throw new IllegalArgumentException("InvalidFile", "File cannot be empty");
}
using (var stream = new MemoryStream())
{
await file.CopyToAsync(stream);
await _documentGenerationManager.UploadCertificateForInvoiceAsync(invoiceId, stream, file.FileName);
}
return(NoContent());
}