Hi, so when I create a new lecture, under the + Contents section there are three items I can add: Video, Video & Slide Mashup and Article. Then it says underneath "Select the main type of content. Files and links can be added as resources". I was wondering if I can add a PDF file instead, which I can click the free preview function so it can be easily viewed and downloadable when students are looking to potentially purchase my course? I know when I add a video, I have the option for it to be viewable for free and also have the option for individuals to download. I want to essentially do the same for two PDF files.