//function to change names of each file in folder
function non_native_file_name_changer(folderID, fileName, fileType,iterator) {
  var folder = DriveApp.getFolderById('1bR61QEhHGBoMZX1ZX-POKZQext4AhrKd');       //get folder ID by opening folder, copying text after "/folders/" in URL
  var files = folder.getFilesByType(MimeType.PDF);                                //use MimeType object to see various approved document types
  var count = 1                                                                   //index?

  //while loop to iterate through all files
  while(files.hasNext()){
    var file = files.next()

    if(iterator === true){
      file.setName(file.getName().replace("_SCRUBBED","_Final"));     //if iterator is working, replace
    }else{
      file.setName(file.getName());
    };
  };
};

//execute function
function start(){
  var folder_ID = "1bR61QEhHGBoMZX1ZX-POKZQext4AhrKd";                 //get folder ID by opening folder, copying text after "/folders/" in URL
  var file_Name = "11.04_01_EU Supply Chain_SCRUBBED.pdf";             //first file name within folder
  var file_type = MimeType.PDF;                                        //Mime Type is google function to select approved file types
  var have_a_count = true;                                             // have a count is an iterator-type variable

  //executable function feeds in above args
  var go = non_native_file_name_changer("1bR61QEhHGBoMZX1ZX-POKZQext4AhrKd",file_Name,file_type,have_a_count);
};