I recently had an issue wherein some of my clients found that hyperlinks in the PDFs which I had sent them did not work. Two clients were on a Mac, opening the doc in Reader, another on a PC. I sent the PDFs to numerous different people and some could access links, others could not. The pdf was created using Indd cc 2018 and later also 2019. This was "solved" by a Tech Support Rep who advised me that Adobe doesn't guarantee usability of links in PDFs if they have been uploaded to a server other than the Adobe Cloud. So my complaint is that that is terrible. Universal access is/was why PDFs are/were so popular and useful. PDfs get passed around and there is no guarantee what kind of server they'll wind up on. If this is a deliberate feature, then it's really awful and should be changed. If it's a bug, then it needs to be fixed. It's got me looking for an alternative way to share files.