In addition to the content created in Totara, instructors may upload files into Totara. These files need to adhere to 508/WCAG accessibility guidelines as well. PDFs and Microsoft Word, Excel, and PowerPoint documents are the most common types of uploaded files. Audio and Video files will be handled via the custom plugins.
If there is a question about these guidelines, please refer them to EBIZ for us to consult with you. It will be much easier for you to take care of things early on than remediating files afterwards as that can delay the release of your course.