I'm working on a front-end form plug-in and create shortcode to display front-end form on a page or post.
While I was testing, I found all image files uploaded by
Add Media button which will be inlined in content will get
post_parent value from the actual page/post that has my shortcode in it.
I want to update
post_parent to the ID of newly created post that generated by my front-end plugin.
I'm assuming I can use
wp_update_post( array( 'ID' => $att_id, 'post_parent' => $post_id ) );
But how I get all the IDs of images it will be inlined in content(Uploaded by Add Media button)?