the_content() not working on single post type

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Is the_content() not working on your single post type? All you may need is to wrap the_content() function with your post’s loop.

Making the_content() work on post types

If your the_content() function is not working, try to wrap this with the post’s loop using a while loop.

while ( have_posts() ) : the_post();
     the_content();
endwhile();

the_content() with custom post types

To use a custom post type, you need to feed your arguments into the loop as per this guide.