Discover how Synology NAS simplifies iOS and macOS file management, backups, and photo organization for Apple users. Secure, ...

I'm still pretty convinced it has something to do with inconsistencies in ACL's and recycle bins, and while no additional effort was expended to see if it was Mac or Synology setup specific ...

While there are plenty of different options to choose from, you might want to check out the Synology DS124 ... Not only is this device simple to set up, but it's also affordable.