Users could already add documents / links to a specific day of a trip, eg a hotelbookingconfirmation. These documents / links will be visible on that tripday. And these will be visible on via the Trip Documents link of the active trip.
Users now can also add documents to their own profile, eg a passportpicture or an insurance card. These will be visible on the profile page. And these will also be visible via the Trip Documents link. This is both for an active trip and for all the trips on which this user is a tripper.