To attach files to a task, firstly select the task by clicking its title in the task list. Then in its detail panel click the 'Attach files' button.
You have the option of either adding files that are stored directly in Glasscubes, or files that are located on your hard drive or network.
Adding files to a task's comment
After you have added your comment you have the option to attach, or drag and drop, files into your comment.