In this case, downloading the pdf and getting it onto an iPad is one step I would hope to avoid for the people who are looking at this for several reasons.
It seems to me, connecting to outside links is not high tech and there must be a fix I am missing.
It seems that Safari on the iPad should do it, that perhaps I need to set something, somewhere.
Again, it works on Kindle browser and Safari on my laptop (and all the other browsers I use)
If the fix is not in the set up in Adobe, perhaps the answer is in an Apple Forum re iPad iOS Safari.
Again thanks for your help.