Why are changes made to a Draft email that is opened in FYI from a Document Link not saved when edited in the Preview screen?

Issue
I am opening a draft email from a Document Link and making changes using the Preview full screen that displays, and then closing the browser tab to close the Preview. When I open the email from FYI, the changes have not been saved.

Cause
The browser tab is being closed which means the changes are not being saved.

Solution
Close the Preview screen by clicking the X in the top right-hand corner and this will save the changes. Clicking on the email in FYI and opening the Editor pane will show the changes.