How to set metadata for ebooks email to Kindle

Hi
Sorry if this questions is a repeat, but I've been trying to find the solution to this what I hope is actually a small problem.

ereader: Kindle [version bought 2 years ago] number 10

Currently I've added my ebooks into calibre

I've added a metaplug, so when I transfer to device they appear as follows:

Title
Author - Series: Series_index

And it works fantastic.

But when I email the same ebook to kindle using calibre

It arrives, but only with the bare basics

Title
Author

No series information if available...
Please advise what I am doing wrong