Calibre showing "Unknown" books after sending to KOReader

[ebonyandlace]

Hi all,

I've recently JB my Kindle PW and was able to get the wireless sending to device over to KO Reader using this template after various instructions/threads on here and reddit.

- I created a custom Sort column where it's split by Fanfiction, Webnovels, Fiction and Nonfiction.
- The save template I use is: {#sort:||/}{author_sort:||} - {title} which I updated on the sending template and the device configuration
- The epubs transfer correctly to the correct subfolder
- However, although the files send and come up as "On Device" - when I click on the actual device they come up as Unknown
- I can manually link (as per first book) but wasn't sure if others were having to do that as it seems counterintuitive based on the 'automation' factor of setting up the template

Does anyone know why the unknown list is happening on the device? Thank you in advance!