通过使用Selenium Webdriver上传文档，它显示错误消息

Question

在表单填写页面中，用户需要上传图像或pdf文档以供参考，但无法上传

WebDriverWait wait111 = new WebDriverWait(driver, 20);
            WebElement invoice = wait111.until(ExpectedConditions.elementToBeClickable(By.className("mat-raised-button")));
            invoice.sendKeys(("user.dir") +"/src/images/1.png");
            Thread.sleep(5000);

还有

WebElement uploadElement1 = driver.findElement(By.xpath("//*[@id=\"main-wrapper\"]/app-registration/div/div/app-redeem/app-step2/mat-card/mat-card-content/form/div/div[12]/a"));
            uploadElement1.sendKeys("/home/hashconnect/Downloads/2.png");
            Thread.sleep(5000);

和

driver.findElement(By.className("mat-raised-button")).sendKeys(("user.dir") +"/src/images/1.png");

它应该上传文件，但显示错误消息，如

  

“线程“主”中的异常”   org.openqa.selenium.ElementNotInteractableException：元素不   可互动的”