If you have a symmetrical chain, with inner and outer plates the same (most are) and with the plate shapes the same top and bottom (again most are) then it doesn't matter since everything is the same.
There may be one caveat to that. If you use a system where you push in a splicing pin like Shimano does, there may be a preference in whether the pin is pushed from the outside inward, or the reverse. There may also be a preference for that pin being in front or the back of the outer plate it engages. So you'll want to check the maker's user guides.
OTOH- with connector links and symmetrical chains, there are 4 possible right ways and no wrong ones so the odds are greatly in your favor.
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