My links are broken because mega.io deleted my accounts for copyright violations twice and reuploading hundreds of books yet again is not my idea of spending time meaningfully. The biggest challenge in posting books here was identifying the ones which are worth posting, not finding them, what with all the free library sites like welib.org or annas-archive.li stocking them anyway. Only today somebody asked in a post about a series of books "Is No. 1 available?" (it is) without bothering to search the forum library first. Makes me wonder how serious some people are in their quest for knowledge... Besides, everybody should read this thread:
My favorites are: https://thepiratebay.org/ [virus alert for this site] https://welib.org/ but WeLib is king for me.
wizardforums.com
I've never ever uploaded a book I bought myself, only books I found on the internet. If I can find them, so can you. Reuploading my own shared books is thus redundant and much too time-consuming. Those two mega cancellations involved +31 GB of books, I won't spend weeks and months reuploading them for the second time only to have my account terminated yet again. My whole collection can be downloaded from a third-person mega account anyway (see my signature).
Moreover, the forum library is a collection of books posted by volunteers, not an official educational institution. No poster is under any obligation whatsoever to reupload his or her books or update threads.
To answer your question directly: yes, you're free post a reupload request but please don't use the Report button, it's for reporting rule violations to the forum staff only. Of course you're also free to get a mega.io account, find the book concerned and reupload it yourself as other public-minded members are already doing.