3) Click on the "Manage Appendix" button. Then, click on the "Attach File" button to proceed.
4) Deselect the file. The blue stick icon would disappear. Then click "Done" button to continue.
5) It returns to the "Manage Appendix" modal box. It shows the file to be removed. After that, click "Save" to do the update.
6) A successful message returned. Appendix has been removed successfully.