It doesn't sound like you're using any Adobe software this this process, so your question doesn't really belong on these forums.
Sorry, I'm new to this forum, can you advise me as to which forum or
community I should post this question to, since it's regarding my Adobe
Acrobat Reader app on my Android phone?
I tried to ask on the app itself, and they directed me to the Adobe forums
but did not give specifics.
Not sure what to do then. If you can direct me, I'd appreciate it, but if
not, thanks anyway.
You didn't mention before that you're using Adobe Acrobat, or at least trying to... However, this error does not seem to come from that app, so I would think you first need to solve the issue of downloading the file.
When you tap on a link in Google Chrome, do you observe a dialog listing the supported apps? I assume you are choosing 'Adobe Acrobat' among these options. Could you let me know what happens when you choose any other option? I tried reproducing the scenario mentioned by you and was unable to do so, hence, require more details about the issue. Would it be possible to also provide the hyperlink to the PDF you are trying to download or are you observing this issue with all links (for e.g. the first link when you search 'sample pdf' on Google)?
Adobe Acrobat Team