Page template hierarchy problem in Newspaper-child

Hi, i have a custom PHP codes running in 3 static pages. I have created the pages using the wordpress back-office, and writing the title and using the default template.

For example, the ID of one of them is 100, with slug “contacto”.

I folowed the Template hierarchy and re-named a copy of “/Newspaper/page.php” file in my theme child.

Single Page #

custom template file – The page template assigned to the page. See get_page_templates().

page-{slug}.php – If the page slug is recent-news, WordPress will look to use page-recent-news.php

page-{id}.php – If the page ID is 6, WordPress will look to use page-6.php.

page.php

singular.php

index.php

In my case i chosse using this name: page-archive.php (but i tested with page-100.php too)
I am running this in mi localhost and in other hosting for testing purposes, and are working great.

Working in a new server:
The strange thing is that now, i have imported 160.000 news , and for an unknown reason this hierarchy don’t work any more. Now is working in localhost.. “the same files”!! but in the real production server this is not working.

Then i created all these files with empty content. Only with the line <?php echo ‘page-slug.php’;?>.
And they never load!.

Why is this happening?.

I’m trying to add a new template to a child theme but the documentation does not even mention where to exactly add it. Should I copy td_config.php to CHILD_THEME/includes? Please at least provide instructions. Thanks in advance.