Copy modules from a theme

I downloaded Grav.<br>
Then I copied some modules from the Mache theme into the user/pages/01.home directory (with the adapted modular.md file). Then the associated twig files in the user/themes/quark/templates/modular directory.<br>
But in the administration of the site I no longer see my 01.home folder.<br>
Did I forgot something ?<br>
Thx

Ok ! No tab in a md file...<br>
I have something finally showing up on my site.<br>
But I still have an error "ERROR: modular/clients.html.twig template not found for page: /home/_clients".<br>
I placed the twig file in the correct folder but it doesn't show up in the admin template picker list.