Different file types allow different capabilities. For example, you can download pdf files. However, the Scholar Annotation tool will not work with pdfs but will for html and some electronic books.
Full Text PDF: The Odyssey Fagles Translation
Full Text HTML: The Odyssey translated by Samuel Butler
Audio: YouTube of Ian McEllen Reading the Fagles Translation Chapter 1(other chapters are linked)
EBook: The Odyssey Graphic Version