[chaley]

Originally Posted by navegacalibre

Of course i know {title_sort} is no valid.

{title_sort} is a valid template field in save-to-disk (and everywhere else). For example, with the tweak set to

save_template_title_series_sorting = 'strictly_alphabetic'

and doing a save-to-disk of the book with the title

An empty book to delete later

using the template

{title} --- {title_sort}

the following file name is generated

An empty book to delete later --- empty book to delete later, An.txt

as shown by the attached screen capture.