selenium-webdriver-click-on-hidden-elements

gistfile1.txt

https://stackoverflow.com/questions/12363038/selenium-webdriver-click-on-hidden-elements

WebElement elem = yourWebDriverInstance.findElement(By.xpath("//*[@class='goog-menu goog-menu-vertical uploadmenu density-tiny']/input"));
String js = "arguments[0].style.height='auto'; arguments[0].style.visibility='visible';";

((JavascriptExecutor) yourWebDriverInstance).executeScript(js, elem);
The above bunch would change the visibility of your file input control. You can then proceed with the usual steps for file upload like:

elem.sendKeys("<LOCAL FILE PATH>");