I have noticed similar behavior with WebDAV synchronization where Enpass appears to connect successfully, but the latest changes are not always pulled or pushed across devices. The fact that the NAS logs show requests from the macOS client but no actual data update suggests the connection itself is working, while something may be failing during the synchronization process. Hopefully the Enpass team can check the macOS WebDAV sync mechanism and identify whether there is a caching, conflict detection, or update handling issue causing this.