Saving XCODE file - Synced folder


Since I started to sync my documents in Mac, I get this warning when I save a file in Xcode.
"This document’s file has been changed by another application since you opened or saved it. The changes made by the other application will be lost if you save. "


Is this related to MCH (I believe it is because i wasn’t getting this before) , and why is this happening?


It seems that this would be a system specific issue and this file “AppDelegate.swift” might be open or modifying by another application in system background which results, same error message.
You may try to upload same data file from and check whether you are getting same error message or not.