The PC at location 1, which has Planner, and the PC at location 2, which has APC, have the same dictionary structure i.e.:- C:\Users \John \My Documents \ACP Astronomy \ Plans. (Similarly for Logs and Images) Is that correct? if not, what should I have, please ?
It's irrelevant. From computer 1 (your computer) you use the web browser, and ACP on computer 2 (observatory) manages those web visible files in a place it knows and cares about.
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I think you are making it too complicated. I will be happy to log onto your computer 1 and demonstrate it. Once you see it you'll understand. Let me know what times are good.