Apps Script function does not update PDF

I’ve been working on some custom features for a form made in Google Sheets to generate a pdf of the form and also update the PDF is changes are made and saved from the Sheets document.

My below code runs fine after some trouble shooting on a previous question thread, but the PDF remains unchanged even though I have updated and saved the underlying document and ran the function, with no errors.

Here is my script as it stands:

    function replaceFile(theBlob, theFileId) 
{
  var oldFile = DriveApp.getFileById(theFileId);
  Logger.log(oldFile.getId());
  try
  {
    
    Drive.Files.update(
  { mimeType: oldFile.getMimeType() },
    theFileId,
    theBlob,
  { supportAllDrives: true }
  );
    
    Logger.log(Drive.Files.get(theFileId, {supportsAllDrives: true}).getName());
    Logger.log("Success!");
    SpreadsheetApp.getActive().toast("PDF Updated With Success");
    
    
  }
  catch (error)
  {
    Logger.log(error);
    SpreadsheetApp.getActive().toast(error);
    
  }

}

function test1 ()
{
  var spreadsheet = SpreadsheetApp.getActiveSpreadsheet();
  SpreadsheetApp.flush();
  var pdfBlob = spreadsheet.getAs('application/pdf');
  replaceFile(pdfBlob,"1ZuftxjH8t6WVKR-sxHl98iywhRPDHnC-");
}

link to previous relevant question:
Overwriting PDF File with Google Apps Scripts Causes Drive App to be unable to locate file