Hi @ManyQuestions, looks like @martinhache provided an example of how to upload an image to WordPress over here. It seems to me you can follow this up with the HTTP Request node sending a POST
request to https://example.com/wp-json/wp/v2/posts/<id>
with a featured_media
body parameter sending the ID of the image you’ve just uploaded.
Let me know if you run into any error trying this.