(Posting this here bc chat won’t let me)
Unfortunately, I had to delete that book due to personal reasons and me leaving the fandom. All though the book may not be recovered, it may still be converted into a rewrite including a different fandom other than Undertale (ex: Genshin Impact, FPE, TSAMS).
Tysm for recommending the book while it was still available. I really appreciate it. ^_^