Open PDF while running Unity application

Good evening,

Recently I was trying to create an app in Unity where with a button I could open an image or a pdf while the app remains open and running. I thought that maybe if I defined several 2D Empty Objects (as Images, Raw Images...) the app would still run while doing this.

I tried to open a pdf file with the Hololens emulator and, although it opened the pdf with the Microsoft Edge, the app stopped running. To open the pdf file I manage to used the WWW class.

I was wondering if there is a way that I could open the pdf file and it doesn't break the entire process of the app, something like a pop-up link. If there is no way to do this, how did you manage (how do you think is possible) to open a pdf while running an app?

Thanks a lot for your help!

Best Regards