Renames a file submitted through a Google Form. Mine is set up to rename it to the email (before the @) and then the name the person typed in. So if jat5@g.clemson.edu submitted it with the name IronMan, the file would be "jat5 - IronMan.mp4"

Rename File.gs

function RenameFile() {
  var form=FormApp.getActiveForm();
  var length=form.getResponses().length;  // returns the total number of form submissions

  
//replace QUESTION NUMBER through the index of the question prompting the file upload - keep in mind that the first question has the index 
  var FILESUB = 0;  //Where this is the question number starting at 0 that is the file submission.  In my file it's the first question.  Text description boxes don't count
  
  var id=form.getResponses()[length-1].getItemResponses()[FILESUB].getResponse();
//  Logger.log('id = '+ id);
  
//get the email address and other information
  var thisEmail=form.getResponses()[length-1].getRespondentEmail();
  thisEmail=thisEmail.split('@')[0]; //get just the first part before the @g.clemson.edu 
//  Logger.log('thisEmail = '+thisEmail);
  
  var thisName = form.getResponses()[length-1].getItemResponses()[2].getResponse();
  var thisMajor = form.getResponses()[length-1].getItemResponses()[3].getResponse();
  var thisMinor = form.getResponses()[length-1].getItemResponses()[4].getResponse();
  var thisHometown = form.getResponses()[length-1].getItemResponses()[5].getResponse();
  var thisApplause = form.getResponses()[length-1].getItemResponses()[6].getResponse();
//  Logger.log('applause = '+thisApplause); //It's giving the string response... so I changed the response to start with abcd
  var thisApplauseLetter = thisApplause.split(' - ')[0]
  
  var time = new Date();
  var thisTimestamp = Utilities.formatDate(time, "GMT-04:00", "MM-dd hh-mm-a");
//  Logger.log('timestamp = '+thisTimestamp);
  
//access the uploaded file
  var file=DriveApp.getFileById(id);
  name = file.getName();
  
//change the file name
  var name = thisEmail+' - ' + thisName + ' - ' + thisApplauseLetter +' - ' + thisTimestamp;
  Logger.log('New File Name = '+name)
  file.setName(name);
}