This is why (extracted from your .csv file):
Quote:
File Attachments
C:\Users\leguillou-g\Zotero\storage\DJTF7VFA\137469829.html; ;
C:\Users\leguillou-g\Zotero\storage\EN7K9BD9\151081263.html; ;
C:\Users\leguillou-g\Zotero\storage\X5RTK92Z\094641773.html; ;
C:\Users\leguillou-g\Zotero\storage\726HJPIG\169637190.html; ;
C:\Users\leguillou-g\Zotero\storage\XA5AFUD3\07075649X.html; ;
C:\Users\leguillou-g\Zotero\storage\I6EZFCHV\076181499.html; ;
C:\Users\leguillou-g\Zotero\storage\92E43E93\068551894.html; ;
C:\Users\leguillou-g\Zotero\storage\Q8XQRZNR\060756632.html; ;
C:\Users\leguillou-g\Zotero\storage\HK6QSH8I\060972882.html; ;
C:\Users\leguillou-g\Zotero\storage\CQHQ3K78\159350379.html; ;
C:\Users\leguillou-g\Zotero\storage\8KHGADD9\147110335.html; ;
C:\Users\leguillou-g\Zotero\storage\U7R2EJZH\070838658.html; ;
C:\Users\leguillou-g\Zotero\storage\Z955FTFG\116741872.html; ;
C:\Users\leguillou-g\Zotero\storage\IBZFH4H6\165792078.html; ;
C:\Users\leguillou-g\Zotero\storage\D5TTIC5X\185273734.html; ;
C:\Users\leguillou-g\Zotero\storage\G2PKQH7R\060447184.html; ;
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As my prior post mentioned, ZMI ignores Zotero HTML "web-pages,complete" because they are not a single file, but rather a directory filled with collection of many different little files, such as with extensions .js and .png and .html.
If you want to import a "web-page,complete" into ZMI, you will have to first bundle all of its many little component files together using an existing Zotero plug-in into some single package format that ZMI can pre-process before adding it to Calibre with all of the 26 ZMI custom columns that go with a Zotero file attachment. Example: a .zip or .rar file. ZMI processes single file attachments only (pdf, txt, text, epub, mobi, docx, odt, pptx, xls, zip, rar, etc. etc.).
I believe that Zotero offers a Zotero plug-in that will package your "web-pages,complete" folders into a .zip or a .pdf so that ZMI can import it.
The URL for all Zotero plug-ins is:
https://www.zotero.org/support/plugins.
I suggest:
http://zotfile.com/ since ZotFile seems to be the Zotero "go-to" plug-in for file attachment manipulation. It probably can convert each of your html folders into discrete .pdf files, which would be perfect for ZMI to import.
Added: as a quick-and-dirty (unofficial) workaround just to get your Zotero Item Metadata into Calibre without any file attachments, simply edit your Zotero export .csv file to delete any of the .html file attachment paths shown above. ZMI can then create an empty book for them, but with all of the Zotero metadata found in the .csv file. You will not have the original web page, of course. Later, you could drag-and-drop any "real" book format that you can somehow create for that web page onto the Calibre empty book to add that "real" book format.
DaltonST