The IP address is the same for all transfers in a log, right?

If you need a custom format, use XML logging and transfer it to any format you need, injecting the constant IP address.

See https://winscp.net/eng/docs/logging_xml#parse

is there a log file that gives file access details? I do get the last modified timestamp for a particular file, is it possible to also get the IP address in a log file with a history?
Thank you