Hi,
You can’t add custom post types on the back-end which doesn’t exist on the current installation (current site). That is why I asked if you know the list of the custom post types you need.
For that you will have to use a custom filter instead. Try putting this code to the functions.php file in your active theme directory (from line 3):
Make sure to enter the post types into the $post_type array variable.
Best,Ernest Marcinko
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