workflow3.cs

[FunctionName("ProcessFileFlow")]
public static async Task RunOrchestrator(
  [OrchestrationTrigger] IDurableOrchestrationContext context,
  [Table("metadata", Connection = "TableConnectionString")] CloudTable metadataTable,
  ILogger log)
{
  var input = context.GetInput<ApprovalWorkflowData>();

  var uploadApprovedEvent = context.WaitForExternalEvent<bool>("UploadApproved");
  await Task.WhenAny(uploadApprovedEvent);

  // run through OCR tools
  var ocrProcessTask = context.CallActivityAsync<bool>(nameof(ProcessFileFunction.ProcessFile), input.TargetId);
  await Task.WhenAny(ocrProcessTask);
}