You can add an attachment that is a document or PDF file to any Event within an itinerary. Here's how:
1. Go to the Event
Go to the event you'd like to add an attachment to, and click on the Pencil icon to edit the event.
2. Attach the Document
Scroll towards the bottom of the Event and press Attach Documents.
From there, you can attach any document that has been saved to your computer. Press "Done Editing" once completed.