How to search for a file in subfolders inside subfolders using apps script?

Question

I'm trying to find a file which may be in a subfolder, but it could also be inside a subfolder of a subfolder. I've followed this answer's approach, but still...

When I place the file inside the 'second subfolder, the script is not finding it.

function updateClientWb() {
  var clientId = 'AA001'
  var parent_folderID = 'folderidsafafdasadasda2D-U';

  var parent_folder = DriveApp.getFolderById(parent_folderID);
  var subFolders = parent_folder.getFolders();
  var searchForClientId = "title contains '" + clientId + "'";
  var clientSeoProjectWb = [];

  while (subFolders.hasNext()) {
    var thisSubFolder = subFolders.next();//THIS IS PROBABLY WHERE THE FLAW IS
    var clientFiles = thisSubFolder.searchFiles(searchForClientId);
    while (clientFiles.hasNext()) {
      var files = clientFiles.next();
      if (files.getName().indexOf('File Name Part') > -1) {
        clientSeoProjectWb.push(files.getId());
      }
    }
  }
  return;
}

Appreciate your help

Answer 1

Files in folders

function getFilesAndFolders() {
  const fldr = DriveApp.getFolderById(gobj.globals.projectsfolderid);
  SpreadsheetApp.getActive().getSheetByName('Sheet0').clearContents();
  SpreadsheetApp.getActive().toast('Entry');
  getFnF(fldr);
  SpreadsheetApp.getActive().toast('EOF');
}

function getFnF1(folder = DriveApp.getRootFolder()) {
  let tree = JSON.parse(PropertiesService.getScriptProperties().getProperty('FnF'));
  //Logger.log(JSON.stringify(tree));
  if (tree.level < level) {
    tree.level = level;
    PropertiesService.getScriptProperties().setProperty('FnF', JSON.stringify(tree));
  }
  const files = folder.getFiles();
  let row = Array.from([...Array(level).keys()], ((x, i) => { if (i == level - 1) { x = folder.getName(); } else { x = ''; } return x; }));
  tree.txt.push(row);
  row = Array.from([...Array(level).keys()], ((x, i) => { if (i == level - 1) { x = 'bold'; } else { x = 'normal'; } return x; }));
  tree.fwt.push(row);
  PropertiesService.getScriptProperties().setProperty('FnF', JSON.stringify(tree));
  if (files.hasNext()) {
    let row = Array.from([...Array(level).keys()], ((x, i) => { if (i == level - 1) { x = 'Files:'; } else { x = ''; } return x; }));
    tree.txt.push(row);
    tree.fwt.push(['normal']);
    PropertiesService.getScriptProperties().setProperty('FnF', JSON.stringify(tree));
  }
  while (files.hasNext()) {
    let file = files.next();
    let row = Array.from([...Array(level + 1).keys()], ((x, i) => { if (i == level) { x = file.getName(); } else { x = ''; } return x; }));
    tree.txt.push(row);
    tree.fwt.push(['normal']);
    PropertiesService.getScriptProperties().setProperty('FnF', JSON.stringify(tree));
  }
  const subfolders = folder.getFolders()
  while (subfolders.hasNext()) {
    let subfolder = subfolders.next();
    level++;
    getFnF1(subfolder);
  }
  level--;
}