Many manga tankobons sold in stores in Japan come with limited-edition illustration cards created by the book's artist/author. Is there some way for Mangadex to add them (if they're available) to a title in the same way book covers are shown? These cards don't really fit into the storyline so adding them as one-page "chapters" for a series isn't the best way to include them, I think.
There are other promo materials for various series as well as series illustrations by the author on Twitter, Pixiv etc. which could perhaps be uploaded too.
There are other promo materials for various series as well as series illustrations by the author on Twitter, Pixiv etc. which could perhaps be uploaded too.