rest_insert_attachment action-hook . WP 4.7.0

Fires after a single attachment is created or updated via the REST API.

Usage

add_action( 'rest_insert_attachment', 'action_function_name_2349', 10, 3 );
function action_function_name_2349( $attachment, $request, $creating ){
	// action...
}

$attachment(WP_Post)

Inserted or updated attachment object.

$request(WP_REST_Request)

The request sent to the API.

$creating(true/false)

True when creating an attachment, false when updating.

Where the hook is called

do_action( 'rest_insert_attachment', $attachment, $request, true );

Where the hook is used (in WP core)