We are running into lots of issues with syncing document libraries from our on-premises SharePoint 2013 server. Users consistently see failed file syncs with errors like this:
We’re having trouble downloading this file. It may be too large or there may be a network connectivity problem. Please try again later.ICsiError: csierrWebService_GenericFail (0x640)
Does anyone have tips on how to troubleshoot what is causing the download to fail?