I've created a plugin from which I want to load the template for my custom post type. I've used this guide to load the template from plugin Click Here!
The templates are loaded perfectly in the page post type even though I've already specified the custom post type name in the page template header.
Template Post Type: custom-post-type
I can create a template in the theme folder and it perfectly works with custom post type.
The templates in your plugin don't show up in your CPT because the templates are loaded from your theme (or child theme).
You'll need to either
In the second case (which I've had to do a few times), I use something like this for the template in the theme / child theme:
<?php
/**
Template Name: My Custom Template
*/
include WP_PLUGIN_DIR.'/my-plugin/templates/my-template.php';
...while I'm sure there's a better way at it; this works quite well. If you want to get really fancy, you could also add something to the plugin's activation hook that copies this into the current theme.
