You should be able to add a resource to link to a file or webpage. You need to click the button that states upload or choose file. This new window gives you an opportunity to create a new folder to store your files otherwise Moodle will default the files in a directory outside of the domain name. You will see this if you have access to the website via FTP. Additionally a quicker way to upload the files into the directory is using an FTP. Once the files are there, you can assign (Resources) to the files. I hope this helps.