[bpbiszkopt]

Hello,
i recently bought Clara 2e and i thought that i can simply upload my epub by usb cable to the reader and voila, read my books.
But when i copy directly ( or by calibre ) my epub files they aren't showing in my books menu...none of them.

Koreader/plato works fine, i see my epub files ( with covers ) and i can open them and read.

My books menu showing only graphics files ( some koreader/plato png )...

Is this normal behave on kobo readers ? For daily reading i'm using inkpad 3 and don't know how kobo works.
I have latest firmware