Why Sent Item neither seen nor syncing Under Gmail Account In Mail apps Windows 10 Pro

[Windows Central Question]

My Desktop OS is Win 10 Pro and my mobile is LUMIA 550 with 10 OS. In Both, the mails sent from gmail account does not show up in the Sent Item(Folder itself not seen) nor syncing. It would be of great support for people on the go to check what is sent and read out for reference.

Anyone has solution, come out please