An kepub which does not want to import into my kobo clara hd

[Planetibo]

Good morning!
Thank you very much for the development of kepubify, I use it regularly to read epubs of books that I have in paper version.
It sometimes happens to me that certain kepubs are not detected by the kobo clara hd even though the epub file is detected.
When I unplug the kobo I see the import progress bar and it disappears and the kepub book is not present.
I don't know why, does the kobo generate a log file to undertand what appends during the importation?
I can send you an epub for the example.

[pgaskin]

You can check the syslog by running logread with NickelMenu or telnet. That may have some information. I also recommend validating the EPUB file; if you give kepubify garbage, it will result in garbage. If you send me the EPUB, I can see if there's anything obviously wrong with it, but I don't currently have time to look at it in depth.