获得非常嵌套的元素（RSelenium），但是如何？

Question

我想使用RSelenium使我的电子邮件自动化，但是有一个非常嵌套的元素（请参见标记位置），这使我花费了几个小时。这不起作用：

es1 <- remDr$findElement(using = 'xpath', value = '//*[@id="id6"]') 

然后我尝试这个（洋葱策略）：

es1 <- remDr$findElement(using = 'xpath', value = '//*[@id="app-contents-wrapper"]/atl-app-stack/atl-app-iframe[3]')$findElement(using = 'xpath', value = '//*[@id="thirdPartyFrame_home"]')$findElement(using = 'xpath', value = '/html')$findElement(using = 'xpath', value = '/html/body')

到目前为止，每个人都很好！但是，如果我拖了下一个：

es1 <- remDr$findElement(using = 'xpath', value = '//*[@id="app-contents-wrapper"]/atl-app-stack/atl-app-iframe[3]')$findElement(using = 'xpath', value = '//*[@id="thirdPartyFrame_home"]')$findElement(using = 'xpath', value = '/html')$findElement(using = 'xpath', value = '/html/body')$findElement(using = 'xpath', value = '//*[@id="id56"]')

R产生了此错误消息（并且如果我直接执行id6，也是如此）：

Selenium message:no such element: Unable to locate element: {"method":"xpath","selector":"//*[@id="id56"]"}
  (Session info: chrome=69.0.3497.92)
  (Driver info: chromedriver=2.42.591071 (0b695ff80972cc1a65a5cd643186d2ae582cd4ac),platform=Linux 4.15.0-34-generic x86_64)

Fehler:      Summary: NoSuchElement
     Detail: An element could not be located on the page using the given search parameters.
     Further Details: run errorDetails method

有人可以解决这个问题吗？