Saving a specific sheet from the workbook as a PDF

I have 3 sheets in my workbook and I want to save a specific sheet as a PDF to a specific folder in my Google Drive. I have this code below. However, it is saving the entire workbook as PDF and not that specific sheet.

function checkSheet() {
  const ss = SpreadsheetApp.getActive();
  const sh = ss.getSheetByName("Tracking");
  var fldr = DriveApp.getFolderById("folder id");
  if(sh.getRange("C6").getValue() == "Yes") {
    var theBlob = ss.getBlob().getAs('application/pdf').setName("mypdf");
    fldr.createFile(theBlob);
  }
}

Tracking - is the sheet that I want to save as PDF
folder id - is the id taken from the url of the folder where I want to save the PDF file

I tried looking for different syntax for getBlob and I am not able to get that specific sheet saved as a PDF. Here are is a link that I referenced.

https://stackoverflow.com/questions/38335143/export-single-sheet-to-pdf-in-apps-script

I thought that your referenced thread will be useful. But, from your question, I couldn't understand your tested script. So, in this case, I would like to introduce the modified script using your referenced thread.

Modified script:

function checkSheet() {
  const ss = SpreadsheetApp.getActive();
  const sh = ss.getSheetByName("Tracking");
  var fldr = DriveApp.getFolderById("folder id");
  if (sh.getRange("C6").getValue() == "Yes") {

    const sheetName = "Sheet1"; // Please set the sheet name you want to export as PDF format.
    var sheets = ss.getSheets();
    for (var i = 0; i < sheets.length; i++) {
      if (sheets[i].getSheetName() !== sheetName) {
        sheets[i].hideSheet();
      }
    }
    SpreadsheetApp.flush(); // This might not be required to be used.
    var theBlob = ss.getBlob().setName("mypdf");
    fldr.createFile(theBlob);
    for (var i = 0; i < sheets.length; i++) {
      sheets[i].showSheet();
    }

  }
}

• When this script is run, only "Sheet1" is included in the exported PDF file.

• By the way, in this case, when the blob is retrieved from Spreadsheet, the Spreadsheet is automatically converted to PDF format. So, in this case, var theBlob = ss.getBlob().getAs('application/pdf').setName("mypdf"); can be replaced with var theBlob = ss.getBlob().setName("mypdf");.

Note:

• As another approach, in this case, when the endpoint for exporting the Spreadsheet as PDF format is used, the modified script is as follows.

  function checkSheet() {
    const ss = SpreadsheetApp.getActive();
    const sh = ss.getSheetByName("Tracking");
    var fldr = DriveApp.getFolderById("folder id");
    if (sh.getRange("C6").getValue() == "Yes") {
  
      const sheetName = "Sheet1"; // Please set the sheet name you want to export as PDF format.
      const url = `https://docs.google.com/spreadsheets/d/${ss.getId()}/export?format=pdf&gid=${ss.getSheetByName(sheetName).getSheetId()}`;
      const blob = UrlFetchApp.fetch(url, { headers: { authorization: "Bearer " + ScriptApp.getOAuthToken() } }).getBlob();
      fldr.createFile(blob.setName("mypdf"));
  
    }
  }