Try this:
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>");
Be aware, by changing the visibility of an input field you are meddling with the application under test. Injecting scripts to alter behavior is intrusive and not recommended in tests.