You can upload PDF files as lesson content. Students will be able to view and download the PDFs from their lesson viewer on the course's website.
Navigate to the Curriculum & Content screen for your course and click the desired lesson.
Click the [+] Insert Content button, then choose the PDF option.
When the upload panel appears drag and drop a PDF onto it or click the Select PDF button to choose a file to upload.
When your PDF file is finished uploading you'll see a preview of it on the screen.
Click on the preview or the Open link to view the uploaded file in a new browser window/tab.
You can also click the Download PDF link to download a copy to your local computer.