Here at Paper.li we don't select the content that is featured in papers. The publisher of the paper chooses the criteria and type of content they are interested in.
If there is a Paper.li that has caught your eye and you have content to contribute or feedback to provide, reach out and contact them. Depending on the layout, the owner of the paper is either listed on the right column of the paper (above the "Editor's Note") or just under the top banner of the paper.
Via social media: Contact the publisher via one of the social media channels listed under the publisher name. Click on the social media symbol that appears under the publisher's name to contact the publisher via that social channel. Note, however, that their privacy settings may prevent you from sending a message.
Via email: If the publisher has allowed readers to contact him or her by email, you will see the option to email him or her as well.