Is it possible to interact with hidden elements with capybara

I have a file field that has opacity: 0 and is overlaping a fake button. Its a common css technic to fake a sort of "Upload button" that displays consistently across different browsers.

Capybara doesn't allows me to call attach_file on that input. The error is Selenium::WebDriver::Error::ElementNotVisibleError: Element is not currently visible and so may not be interacted with.

Anybody knows any way to force capybara to interact with invisible elements?

The answer is still unanswered, but I've found a work around. Nothing intelligent, just make visible the element with a simple script

  page.execute_script %Q{
    $('#photos').css({opacity: 1, transform: 'none'});
  }

I post it for the record.