Hello Cynthia,
Thanks for reaching out! I understand that links in the Resource tab open at the top of the course on your end. I ran some tests using Google Chrome, and the PDF link in my sample Storyline 360 course opened in a new tab. Here's a quick recording of my experience.
Do you see the same thing when you click the PDF link in my Review 360 course? What browser are you using to test? Did you also publish to Review 360 or to another platform such as LMS or Web?
If you see something different with your course, can you share your Storyline file to see if something with the link may be causing the behavior? You may also share it privately by sending it along in a support case. We'll delete it when we're done testing.
