TipsTricksTests.java

@Test
public void fileUpload() throws IOException {
    driver.navigate().to(
      "https://demos.telerik.com/aspnet-ajax/ajaxpanel/application-scenarios/file-upload/defaultcs.aspx");
    var element = driver.findElement(By.id("ctl00_ContentPlaceholder1_RadUpload1file0"));

    String filePath = Paths.get(getProperty("java.io.tmpdir"), "debugWebDriver.xml").toString();
    File destFile = new File(filePath);
    destFile.createNewFile();

    element.sendKeys(filePath);
}