For anyone else that comes accross this post and wants to create/attach notes. I’ve made a blog article and Youtube walkthrough video. It’s hot off the presses. I walkthrough complete Postman setup and how to get the session ID, how to create a lead, query a lead, update a lead, create a note and link it to the lead, and then upload a file to the note. Enjoy! Hopefully this saves someone else days of stuggle!