Be default, when you press the Open Log button, it creates a new file with the name logifle.html and deletes the old one.

If you want to append more information to a current log file, before pressing the Open Log button, push the button below it, Replace Old Log. After pushing this button, it will change to Append To Old Log.

Now when you push Open Log the new log information is appended to the old log file.

Note: If you push Open Log while the button below says Replace Old Log, you have deleted the old log file and there is no way to get it back.