How to add a document to my trip?
You can save documents in two places: for the trip in general or for an activity specific.
Saving a document to your trip in general
In your Trip dashboard, there's a button "Documents", tap on it and after that just tap on "Add a Document" button. Now you can choose between any type of document and include in your trip. All documents are shared with your guests as well.
Saving a document to a specific activity
There's also the possibility of adding documents specific to an activity, like a flight ticket, concert ticket or a hotel reservation if you want. To do that go to the details of the activity, and tap the button "Add a Document" in the bottom of the screen.