Is it possible to have thumnail (ie featured image) support for Custom posts ?
I read on a forum that it's possible by adding this to functions.php :
add_theme_support( 'post-thumbnails', array( 'post','custom-post-type-here','another-custom-post-type' ) );
That I can do, but it seems that it is also required to specify thumbnail support when registrering the custom post type:
'supports' => array( 'title', 'editor', 'comments', 'excerpt', 'custom-fields', 'thumbnail' ),
I assume this needs to be done by CPTM