I noticed that a PDF link from a university course I used as a URL to cite doesn't open, unless it's opened from the course portal itself. Within my referencing of the source, I note which link to click to find the correct PDF, and the URL I use is the course portal where the link is.
However, I've never given instructions on how to open a PDF from the right website before within a citation itself, let alone make any kind of offhand note in a citation before. Is it bad prose to do this, and instead just link the course portal URL? If not, how am I meant to properly cite this?