I see I only need Two-way sync for the one folder that each designer would modify - so that if edits to files in that folder were made to the local copy OR to the NAS copy, both copies would be updated.
True if such is actually the case.
It would be even simpler if each designer only makes changes in his/her local "own" folder.
Then for that "own" folder the sync direction is also only one-way (Mac-to-NAS), where for all folders of other designers the sync direction is also one-way (NAS-to-Mac).
That was my assumption in my original reply.
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