After some more testing I just found no way to save the filenames in the way I want through calibre. The template option on calibre seems to only work when saving to disk, and according to the internet when using usb connection, but you can't do usb connection on a kindle with koreader. When sending books to device it seems to follow the same format not matter the template, I don't know if this is a problem with koreader, calibre or with what I'm doing.
If anyone knows the solution to this problem please share, thanks.
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