On the issue of line sketch

[liujiangmu123]

Dear author, first of all, thank you for making such valuable contributions in this industry. When I browse your website, I realize that your line draft optimization effect is the best. However, there is no function to save the optimization of line draft. I am very curious about how your optimization of line draft is realized, as shown in the picture below.

I have the following questions to consult you

1. Could you please tell me how this line draft is generated
   2: whether the website can add the function of saving line draft
2. Is it possible to increase the batch processing function and turn it into payment mode? I think this is worthy of development and praise

Thank you very much for your reply and have a nice day