Next on the list was Resilio-Sync_x64.exe...
It was stored in
C:\installer\network\autosync\resilio_sync\Resilio-Sync_x64.exe
The setup pops up a screen which has a few options, which default to
[x]Create Desktop icon
[x]Open Resilio Sync after installation
[x]Add an exception for Resilio Sync in Windows Firewall
[x]Start Resilio Sync when Windows starts up
Other options:
[_]Install Resilio Sync as Windows service

Since I am trying to stay on the private LAN, I unchecked a few boxes:

[x]Create Desktop icon
[_]Open Resilio Sync after installation
[_]Add an exception for Resilio Sync in Windows Firewall
[_]Start Resilio Sync when Windows starts up
Other options:
[_]Install Resilio Sync as Windows service

Up pops the warning: Resilio Sync may not work correctly unless a firewall
exception is enabled", but I don't see why I need an exception just to
connect to an MTP device connected over USB, do you?

Drat. The Resilio installer is another piece of ****, just like the
GoodSync installer, both of which appear to have been written by fifth
grade coders who haven't figured out that normal coding standards for
decades have been to ASK where the software should be installed into.

The desktop shortcut shows it installed into the ridiculous location
"C:\Users\uname\AppData\Roaming\Resilio Sync\Resilio Sync.exe"

When run, it says "Welcome to Sync", where it has your login name in a box
saying "Choose a name to show when you send and receive folders".

You have to agree to the privacy policy, terms, and EULA,. and then you
have to also check a box saying you're not using it for business use.

Then the "Get Started" box shows up where an annoying ad to subscribe to
their sync newsletter pops up, which you can kill.

The GUI has no menu but has a gear for "preferences", which you perform the
obligatory step of turning off auto updates.

The GUI is simple, which is nice, with a single PLUS sign at the top left,
which presumably is what you hit first.

Hitting the big plus sign, you get a list of options where "standard
folder" seems to be appropriate.

When you hit "Standard Folder" it pops up the Windows file browser where
the LGStylo3Plus connected over MTP on USB shows up and where you _can_
select a subfolder of the phone's SD card.

Hmmmm... nothing happens. It seems to default to the users' Downloads
folder, which I have re-directed on Windows, so maybe it's a stupid program
that has a hard-coded location for the Windows Download folder?

I noticed that the settings didn't take the MTP connected phone sd card
folder, so I changed it to a typical folder in the C:\tmp directory, and
that took, so that's an indication that MTP connected devices may not be
supported.

I did get a Windows Defender request to:
Allow Resilio Sync to communicate on these networks:
[x]Private networks, such as my home or work network
[x]Public networks, such as those in airports...
I never know if I should allow this since I don't want the program going
out on the net for _any_ reason.

Anyway, if I slide a local folder onto the GUI, it accepts it, but if I
slide the USB connected MTP folder from the phone, nothing happens, so this
is, again, a bust in that the program doesn't appear to connect to Android
devices unless, of course, I bother to run a free FTP or WEBDav server on
the Android device in order to enable connecting the device to Windows as a
drive letter.

At least Resilio Sync uninstalled gracefully without phoning home.