How do artist or game devs upload content.

I know this may be a silly question but I was wondering as a content creator, how does a doujin artist or indie game developer upload their content in Fakku?

I'm curious to know the answer too

I suppose their contact email. But 99% of what we got is from licensing from the publishers we work with and the few that they contacted ie GY, Maeda-sensei and soon Amazume-sensei
https://www.fakku.net/forums/books/nana-kaoru-by-ryuta-amazume-coming-to-fakku-fall-of-2022