The standalone version of RAW Power for Mac does not have any synching functionality at this time. The Mac Photos extension can sync through iCloud, because it is integrated with the Photos library. Unfortunately, Apple does not provide a way (currently) for standalone apps to integrate with the Photos library. Sorry.
Thank you for the answer. It’s useful to know so that I can plan my workflow accordingly.
(I’m using the standalone OS version completely independently from the Photos library, with the files stored on my desktop which is synched to the iCloud – which is why I had expected edits to be synched too. It may be worth pointing out that this isn’t the case in future notes on the programme)