For each issue, you can assign attachments, comments, and associations, and so on, using the tabs under Detailsthat are located near the bottom of the issue display.

The breadcrumb navigation functionality is available on tracker item details page. A breadcrumb navigation stripe appears below the header where the Summary is displayed. You can see here the upstream references of the current issue in 3 levels. You see three items per level, if there are more reference items, the other items are visible under the context menu.