I can't update my latest message, sorry for the multiple tred.
I also tried to push the book via kobo system and incredible but I have the same problems.
When i connect my kobo either via kobo-os or koreader, for calibre my latest book it was uploaded in 24/07/2021. For calibre i never uploaded anything after this date.
Moreover, in koreader i can't use meta-data: for latest book uploaded there wasn't tag or series.
This is a super huge, very giant, problem for me. All these books is for my Thesis is necessary that I can archive in the correct way inside my ebook reader, for fastet research.
Please Help me
--Edit
I have no Idea what I did, but suddenly all is come back to the normality.