Yes you could , for releases that have not been posted.
I would like to recommend you to read the general rules: viewtopic.php?f=398&t=210481, also read how to post a release in each section (sticky thread). Checkout these somewhat helpful releases tools, for ebooks: https://forum.mobilism.org/viewtopic.php?f=1&t=2121281, and for programs and apps: viewtopic.php?p=150554. Happy releasing!