Selenium 3.0.1 file upload in chrome in mac OS using java

browser - chrome 57.0 OS - mac sierra 10.12 selenium 3.0.1, java - 1.8

Hello, can someone please help me with uploading files from the window popup in mac OS. When I click on browse button > popup opens but my scripts are not able to focus on popup. It stays on background page itself. When I tried to pass keys command + shift + g >> the small rectangular path window doesn’t open. I have already tried below solutions which didn’t help:

Here is my code with all solutions I have tried. Can you think of any better method I should use that will support execution in Jenkins as well?: (SelectAFile is the text link to upload file)

public void uploadFile (String SelectAFile, String xPathOfSelectAFile, String FileLocation) throws InterruptedException, AWTException{

    driver.findElement(By.xpath(xPathOfSelectAFile)).click();

    // WebElement upload = driver.findElement(By.xpath(xPathOfSelectAFile));
     //upload.sendKeys("/Users/abc/Documents/xxxx/yyyy/zzz.pdf");


    // Actions actions = new Actions(driver);
//actions.keyDown(Keys.COMMAND).keyDown(Keys.SHIFT).sendKeys(String.valueOf('\u0067')).perform();


    //actions.moveToElement(xPathOfSelectAFile);
    //actions.click();
    actions.sendKeys(FileLocation);
    actions.build().perform(); 


  //  driver.switchTo().activeElement();
  // Alert prompt = driver.switchTo().alert();


 Robot robot = new Robot();
    robot.keyPress(KeyEvent.VK_META);
    robot.keyRelease(KeyEvent.VK_SHIFT);
    robot.keyPress(KeyEvent.VK_G);
    robot.keyPress(KeyEvent.VK_ENTER);
    robot.keyRelease(KeyEvent.VK_ENTER);
actions.keyDown(Keys.COMMAND).keyDown(Keys.SHIFT).sendKeys(String.valueOf('\u0067')).perform();

1. Robot.keypress
2. Actions.sendkeys
3. windows.switchto (window id) - in this case, both the window ids are shown same. Basically, I am not able to capture the window id of popup.
4. Sikuli - I am little reluctant to use it as I am working on framework design and eventually my scripts will be shared with other teams and the screenshots that I will use in stimuli may work only for my local or only with one scenario of file uploading. I want to re-use same method at different file uploads.
5. AutoIT - doesn’t work with Mac.

Thank you so much in advance.