Error: WinSCP.SessionLocalException: Element "group" not found in the log file

C# script in SSIS package
Uploading several files to S3
Line 6526 in WinSCPDebugLog file shows an XML GroupName but never finishes rest of XML.
Error: WinSCP.SessionLocalException: Element "group" not found in the log file
Log files and script attached
Thank you for your help.

Your actual problem is this:

Exception: System.TimeoutException: Timeout waiting for WinSCP to respond

You get the other exception only because you swallow the original one and try to call PutFiles once again over a timeouted session.
You get the timeout because you are transferring huge files. Set longer Session.Timeout.

Thank you Martin for the quick reply I will try that.

Related improvement:
https://winscp.net/tracker/1923