Select "File size" in "Comparison criteria". Though it would transfer the file whenever file size differs. Not only if the source file is larger. WinSCP does not support transferring only larger files.

It is about the GUI. I have read that but I still a little lost can you tell me what to check and turn on or off too set it too auto resume if the client side file is larger than home file and to auto skip if it is the same or larger on the home file please.
Thanks Albert

Is this about WinSCP GUI? Or are you trying to write some script to do that?

If this is about GUI, check synchronization:
https://winscp.net/eng/docs/ui_synchronize

Hello, Can someone please help understand the resume function my old FTP program I used? Was pretty simple, if the file was the same size, it skipped it. If it was smaller on the site it would auto resume. Please help me set WinSCP up that way for me. It's a bit hard to understand how to auto do those 2 things.

Thanks Albert