Can I create or upload a template myself?

You can easily save previous designs as templates. To do this, you need to select the option "Save as template" in the settings menu.

If you want to create a new message, click the button ‘Add’. You can then choose the desired tool (smart builder, wizard or editor). You will see that a new section has been added to the bottom of the templates: ‘Personal templates’. Your saved template will appear in this section.