You can certainly simply paste the HTML into a Marketo template. But if you haven't built it with Marketo's modular Email 2.0 syntax, it won't magically know which parts to be editable/substitutable/segmentable.
I'm having such a hard time building a template... I just want to build a simple template and then drag in the modules I need so I can start building my email...but it's not working. How do I do that? Is there a video I can watch...lol
Recommend you study the docs and inspect some of Marketo's built-in templates for pointers.
This isn't an overnight thing, using Email 2.0 syntax in full/correctly is a specialty.
Can someone help me figure out how to create a template with my code? I've been hired to create a template in Marketo (which I have never used and I was honest upfront about having never used Marketo before). I thought I could figure it out as I have used countless other platforms before. But, this one is super different. Unfortunately, my client knows less about Marketo than I do...and I have to create these templates without a clue. Any help would be appreciated.
Sounds like you'd benefit from a couple of training sessions with a pro Marketo designer. Can recommend someone* if you PM me.
* N.B. Self-promo isn't allowed on the Community, and I'm not recommending myself.