Here you can enable "Audit & Report" and "System Log".

Enable Audit & Report
When this option is checked on, Wing FTP Server will capture all the transactions into a database, then you can analyze it and generate reports in real time.
Log Filename
The log file must be given a name before information can be saved to a file. Your system log file will be put in the directory "Log\System" by default. The log filename supports certain wildcard characters as outlined below.
%D - The current day of the month
%M - The name of the current month
%Y - The 4-digit value of the current year, (e.g., 2009)
Log Maxsize
The log file will no longer be written in when it reaches the limit you set here.