Does Marketo support the importing of HTML emails? I know I can copy and paste HTML code into a blank email template, but is there a more use friendly way to import HTMLs for emails designed outside Marketo that I'd want to leverage inside Marketo once fully tweaked and tested? (Yes I know I have to tweak for image locations)
Please move the thread to Products as this section is for website feedback, not product support.
Depends on whether you want to do the work to get there.
A user-friendly interface can be built using the Marketo REST API Email Template endpoint(s) and that UI could well accept multiple files (say, image assets) in a ZIP. But if you're not a developer, this is going to be out of reach.
You could ask about getting a internal program library subscription (though I'm not sure if such a thing exists). Still, you'd need to prepare programs for import, which is sort of a chicken-egg situation.