Got it. Needed to put the file path that has a directory with spaces in it in double quotes.
%2%has a special meaning in WinSCP. It's replaced by the second argument of the script. But you do not pass any. Maybe you wanted to?
/log=path_to_log_filecommand-line argument. Submit the log with your post as an attachment. Note that passwords and passphrases not stored in the log. You may want to remove other data you consider sensitive though, such as host names, IP addresses, account names or file names (unless they are relevant to the problem). If you do not want to post the log publicly, you can mark the attachment as private.