Everything is a post in WP, or almost everything. Posts have different names. a post can be a “Blog Post” which is a post_type of “post”. A post can also be a “Page” which is a post_type of “page”. Media library files are also posts and they are a post_type of “attachment”.
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users