Oh yeah sorry, I misunderstood. I think what you're looking for is local (network) versioning which I've had trouble finding in the past as well. I had hoped SyncThing would do it but it doesn't. Versioning is something a service like git does perfectly (i.e. notifies of and/or resolves conflicts in text files on the fly, seamlessly). When I was doing a lot of writing from different devices I set up a private repo on Github (and later Gitlab) and got my text editor to auto-sync-on-save to the repo (from any device) and it worked great. There are very likely self-hosted solutions that wouldn't rely on the cloud for that, but for me it worked fine as private repos because nobody but me would ever see those drafts (in a perfect world... we all know microsoft has almost certainly trained their shitty A.I. on my terrible writing versions over those years on Github because they own that platform).
I know there are ways to get Git working locally, probably for this purpose, but I don't know of any simple ones to suggest.
That was the same issue I had with SyncThing, it just seemed to conk out at weird times and I gave up on it (for that purpose). It's great for centralizing a directory of files from one machine to another but I didn't love it for keeping a single file up-to-date with changes coming from more than one point on the network.