Hi there. We are taking another look at this now. It's clearly not a WC Add on plugin you are referring to, but an option within Newsletter.
When we go to create a newsletter and opt for the Drag and Drop, the Woo block is not showing. I assume we need to enable something for that to appear, and therefore use?!
Please can you elaborate as the information we find online doesn't get too specific in the setup of this.
Simon