Code for CTRL + CLICK for multiple file selection?

To file the multiple selection, user need to use Actions(), Build(), Perform() methods.
For example, below is the code click more than two files using CTRL keyboard sequence from the keyboard.  I had used www.onedrive.com file storage.

Code:

import java.util.List;
import java.util.concurrent.TimeUnit;
import org.openqa.selenium.By;
import org.openqa.selenium.Keys;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.interactions.Actions;

public class CtrlClick {
 
public static void main(String args[])
{
//invoke firefox browser
WebDriver dr = new FirefoxDriver();
  
//navigate to onedrive.com file storage
dr.get("https://onedrive.live.com");
  
//Implicit wait, this method is used to wait for the webelement to load  
dr.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS); 
  
//assigning the webelement variables
WebElement signin = dr.findElement(By.xpath(".//*[@id='site-nav']/div/nav/ul[2]/li[3]/a"));
  
//click the Sign in button
signin.click();
  
//Assign the variable for email login input field
WebElement emailid = dr.findElement(By.name("email"));
//Type user id;
emailid.sendKeys("onlytest1911@outlook.com");
  
dr.findElement(By.cssSelector(".btn.submit")).click();
  
dr.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);

//EnterPassword
dr.findElement(By.name("passwd")).sendKeys("xxxx@xxxx");
  
//Click Signin
dr.findElement(By.name("SI")).click();
  
WebElement worddoc = dr.findElement(By.xpath("//img[contains(@src, '6XcJqOouagIrfO')]"));
WebElement DocumentFolder = dr.findElement(By.xpath(".//*[text()='Documents']"));

//Getting all the checkbox item in the array list
List ll = dr.findElements(By.className("ItemCheck"));
  
dr.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
  
//Performing CTRL + CLICK option using Actions/Builder/Perform  
Actions builder = new Actions(dr);
builder.keyDown(Keys.CONTROL)
.click(ll.get(0))
.click(ll.get(2))
.click(ll.get(3))
.keyUp(Keys.CONTROL);

// Perform the action.
builder.perform();
}
}