By default UWL will not allow to attach or view any attachments to work items in the UWL inbox
i.e. User will not be able to view any attachments for Leave Request /Purchase Order and Purchase Requisition.
To make the user view the attached documents we need to make changes to a property of UWL iview.
Open the UWL iview and check for the property "List of Preview sections to hide" and make sure the column is empty so that it will not block any of the sections mentioned.
check the attachment for clear understanding.