I have added a safety html page to a canvas module that I have complied for my students. Students are able to answer questions and add inputs however canvas will not save students work for them to come back and complete at a later stage, or save it for me to mark. I have attached file*, it does show in canvas in a webpage format.
*edited to add: the attached file was removed because it was in .zip format that opens as a web page. Here is a screencast of the HTML file as it appears in Firefox. safety-workbook-zip.png