Thank you for your reply.
To Choli and Mnjul:
I do check all the boxes below the option. In fact, it looks like the attachment (Traditional Chinese, I think the position of the boxes are the same in all language?).
To Mnjul:
The logs are just saved under the directory "我的交談記錄 (My Chat Logs?)." The problem is that all logs keep getting larger, instead of being split and archived in a new directory each month.
久仰大名,希望我的英文說明夠清楚
(in Traditional Chinese)