Hi Kazou. If you click on the "Go Advanced" button on the bottom right it will take you to a reply editor with more options. One of those options is an "Attachments" button (indicated by what looks to me like a paper clip). By clicking on the attachments button you will be able to directly upload several different types of files (including pdf) to your reply. Thanks for sharing. I'd also recommend posting a picture of the end result so that people can get a feel for what kind of map this tutorial will help them create.