[foolishbrat]

Dear experts,

Calibre is an amazing software. I sincerely appreciate it.

Now I'm using Kindle Voyage. Firmware version 5.6.5.
Then I converted an EPUB book to AZW3 format using Calibre 2.4.3.

After pumping it to my Kindle, although the file exist in
the `document/` directory, it does not load in my Kindle.

Strangely, Kindle can view the content of existing AZW3 files
which I converted using Calibre older version.

How can I resolve the issue?

Best,
Fool