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We will have to start digging a bit deeper: in your single.php
file on line-number 14
there is this code-snippet:
<?php get_template_part( 'content', get_post_format() ); ?>
The first piece get_template_part
is a WordPress implementation in a custom syntax of the so called “PHP include”.
The second piece get_post_format tells the template engine to look for a file which starts with “content”, then a hyphen and then the name of the “post format“.
If there is no post-format set, then it probably defaults to something like content-single.php
.
So the file which is included, and which you will have to look for now is either content-single.php
or content-aside.php
, content-gallery.php
and so on.
Now in this file you can do what I wrote about before: put this snippet in:
<?php
if ( has_post_thumbnail() ) { // check if the post has a Post Thumbnail assigned to it.
the_post_thumbnail();
}
?>
and in functions.php
add_theme_support( 'post-thumbnails' );