On Sat, 11 May 2019 02:17:52 -0000 (UTC), Arlen G. Holder wrote:

Do you have an existing working freeware-based Windows-hosted automatic
sync setup for all your devices on your home LAN?

This old article shows how to auto sync iOS/Android automatically:
o But it requires a "Windows Live" account, which seems unnecessary to me

How to Sync Android or iOS Devices with Your Windows 10 PC
https://wccftech.com/sync-windows-10-with-android/

I should be clear that any autosync solution must work on the private LAN.
And it can't use banned software which appear to be prevalent on the net.
o Popular Android Apps Banned For Sending User Data To China
https://www.techpart.net/2019/05/07/popular-android-apps-banned-for-sending-user-data-to-china/

This article uses Cheetah Software, where, unfortunately, I don't trust
them based on the latest news of spyware from that company:
o How to Auto Sync Files and Folders over Wi-Fi Between Android Device and Windows/Mac OS X PC
https://www.theandroidsoul.com/how-to-auto-sync-files-and-folders-over-wi-fi-between-android-device-and-windowsmac-os-x-pc/

Looking at the play store link, it seems Google removed them perhaps:
https://play.google.com/store/apps/details?id=com.jrtstudio.SyncFolders

Since nobody has a solution proposed yet for automatic sync, I'll assume
I'm being a pioneer of sorts, where my first approach will likely be to
explore some kind of "rsync" solution ...

This requires a purchase, which negates this rsync as a general solution:
o Rsync on an Android phone
https://blog.jasonantman.com/2012/04/rsync-on-an-android-phone/

I'll solve this problem, but it would be nice if I'm not the first person
to solve it where the general solution requires
o Freeware that anyone can install to test & use
o Windows sync over the private lan (i.e., no Internet required)
o Automation so that it's automatic over USB and/or Wi-Fi
o Syncs to all common consumer devices (Windows, Linux, Android, & iOS)