I want to use a template override for Articles in Joomla, therefore I am using
mytemplate/html/com_content/article/default.php
If I change anything in this file the changes do appear. But as I want to use an extra .php-file f.e.
mytemplate/html/com_content/article/alternativeLayout.php
I am facing a problem. Because although I can select this layout on the article settings page - any Changes I make do not appear and still the default.php is used.
Any ideas what I am doing wrong?
In order for an alternative layout to be used, two conditions must be met -
It sounds like your problem is with #2.
EDIT Duh, I missed the key part of using alternate layouts. In order to be able to use an alternate layout with a menu item, you have to create an alternatelayout.xml file and place it in the override folder. This will give you an additional menu item option that you select when creating your menu item. You should be able to copy the defailt.xml file and edit it for the new layout.