查看过LinkedIn官方论坛有个人回复了这样的Tips：
I sent it successful when I copied (text from reply box) and pasted to new message with the same subject with one Re:.
Try this tip.
在新窗口发送消息保险一点。
更多信息参考下面链接：https://community.linkedin.com/questions/105210/sent-messages-not-showing.html
添加表情
