This is a use case I have struggled with. Here's an example: download all the
pdfs files from this page only (no additional links):
<https://courses.cs.washington.edu/courses/cse160/18sp/exams/>

I have created a new project, added above url, set scan rules (tried both
*.pdf and separately -* +mime:text/html +*.pdf)

but it does not download the pdfs. What am I missing?