pre-plupload-upload-ui action-hook . WP 1.0

This action is documented in wp-admin/includes/media.php

Usage

add_action( 'pre-plupload-upload-ui', 'action_function_name_9639' );
function action_function_name_9639(){
	// action...
}

Where the hook is called

do_action( 'pre-plupload-upload-ui' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores

do_action( 'pre-plupload-upload-ui' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores

Where in WP core the hook is used WordPress