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
When you hover your mouse over an event, a Pencil icon will appear in the top-right corner. Click there to open the Event editor!
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.