I tried adding an thumbnail sized image in the very first line of the post so that I want my category list search should display with this thumbnail and some text with "read more" button but this image is not displaying in the category list view but its displaying when I click on the post. Is there any way to fix it? I tried many plugins but none worked for me.
add_theme_support( 'post-thumbnails' );
The above line is already active in my site. Thanks.