Preview your newsletter, update the HTML each month, and copy it straight into email.
Open this HTML file in any text editor (Notepad, VS Code, etc.).
Find the section marked /* ══ DEFAULT NEWSLETTER HTML ══ */ inside the <script> at the bottom,
and replace the newsletter code between the backticks. Save the file — done!
You can also just paste new code in the editor above while the page is open and click Apply & Preview.