It's nice that you can download and replace an HTML email, but it would also be nice to be able to download the text version of the email and be able to replace the text content version.
You can effectively do that within any mktEditable section or just within the main Body of the email. I usually prefer creating a text version outside of Marketo and then pasting it in. The designer is better than it used to be at copying the HTML text into the Body.
.png)