I am not sure how to save a screenshot of MP4 so I am sending you links to the shots in my DropBox folder. IF this is not helpful, please let me know how to put screenshots in the message.
This is what I started out with
https://www.dropbox.com/s/un5cfr3w9jh351h/before.jpg?dl=0
I edited it to this.
https://www.dropbox.com/s/3xie3vllqgdn4tk/after.jpg?dl=0
While still in the CODE tab, I click save and closed. When I went view it again, it was unchanged from what I started out with.
However, if I changed to the EDITOR tab after making changes and saved it, the changes were saved.
To say this a different way, when changing anything in the CODE tab, I have to move to the EDITOR tab in order to save the changed. I cannot save from the CODE window.
Thanks, Walter