In many cases, people have asked for me to include pdf reports into the hub exerience. This is achievable but the user experinece is detrimentally impacted because there is no "integrated" viewer within hub.
I upload the pdf to AGOL, link it to the hub. However, when a user wants to view the pdf, rather than an integrated experience where the pdf is viewed from within a hub site, the pdf must be downloaded and viewed externally.
My idea, therefore, is to enable pdf's to be viewed from within the browser much as feature services can be viewed as part of the content library experience.