WebUI.click(findTestObject("input[class*='upfile_ultimo']"))
This is not correct. findTestObject method takes TestObject parameter, not a string. If a class is still the same, do following:
String path = ".//input[@class='upfile upfile_ultimo']"
TestObject to = new TestObject().addProperty("xpath", ConditionType.EQUALS, path)
WebUI.click(to)