How do I...How do I attach a file to a Wiki page?
AnswerAn attachment is any file that is included with your page. Examples of attachments are screenshots, photographs, other images, Word documents, presentations, PDF documents, videos and sound files. Attachments are useful when you want to share information that exists in another file format. You can attach files to any page or blog post, provided you have permission to do so.

When a page you are viewing contains attachments, a small paperclip icon appears next to the page byline, under the page name. Clicking the paperclip will take you to the 'Attachments' view, where you will see the full list of attachments.

You can attach a file by selecting Attachments from the Tools menu.

You can also use drag-and-drop to drag files from your computer or file system onto your browser and attach them to your Wiki pages or blog posts. This works for multiple files at once, as well as images, multimedia files, PDF files and Microsoft Office documents. In order for drag-and-drop to work, you must be using a web browser that supports the drag-and-drop functionality of HTML5. (Browsers such as Firefox 3.5, Safari 4 and Internet Explorer 9 offer limited HTML5 functionality and don't support drag-and-drop.)

More information is available on the Atlassian web site's Working with Attachments page.