Files not being deleted from Nextcloud when they are deleted on Windows

I have a setup that used to work great, now the whole sync process has broken down. Here is what I am doing.
There are three ‘computers’ involved Android phone using the FolderSync APK, NextCloud Server, and Windows 10 workstation. Here is what I want to do:
The android accumulated many many files in a folder on the android. This folder is synced to Nextcloud so new files are copied from the Android to NC. Also there is a Windows Workstation what is downloading the files from NC to local. The files are reviewed and then if not needed (most of them) deleted. What what used to happen was when the file was deleted in Windows it would also be deleted off NC and subsequently off the Android. The delete from Windows -> NC is no longer happening.

How do I go about making this work again?