I installed Guru light to do some tests before purchasing the Pro component.
I inserted a pdf into my media and linked it to a section of the course.
On a computer it appears correctly, while on a smartphone a blank page appears.
I also tried changing the pdf but the result is always the same.
On your demo site with Guru Pro, I can't test it because I can't upload my media.
How can I be sure this will work once I purchase the Pro component?