btxml ExportPrintPreviewToImage response フォローする

Hi, when using ExportPrintPreviewToImage btxml, the only way to get the number of pages saved is to set ReturnImageInResponse=true. Correct?

This is not ideal, because I know where the file is stored, and transferring large amounts of base64 image data in the response is not very viable. I just need to know the names of the files stored, or even just the number of pages (because I use %PageNumber% replacement in the file name as the example suggests)