Perhaps you just need to enable (or re-enable) that action in your settings.
On your mail page, hover over the "Gear" icon (top right) and in the drop menu, click on "Settings". Then click on "Writing emails" (from the menu list on the left) and check the box that says---Save sent messages in the Sent folder.
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Verified answer
Perhaps you just need to enable (or re-enable) that action in your settings.
On your mail page, hover over the "Gear" icon (top right) and in the drop menu, click on "Settings". Then click on "Writing emails" (from the menu list on the left) and check the box that says---Save sent messages in the Sent folder.
Then click "SAVE".