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событие не описано

post-plupload-upload-ui хук-событие . WP 1.0

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

Использование

add_action( 'post-plupload-upload-ui', 'action_function_name_4751' );
function action_function_name_4751(){
	// action...
}

Где вызывается хук

wp_print_media_templates()
post-plupload-upload-ui
media_upload_form()
post-plupload-upload-ui
wp-includes/media-template.php 269
do_action( 'post-plupload-upload-ui' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
wp-includes/media-template.php 273
do_action( 'post-plupload-upload-ui' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
wp-admin/includes/media.php 2245
do_action( 'post-plupload-upload-ui' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores

Где используется хук в ядре WordPress

wp-admin/includes/admin-filters.php 25
add_action( 'post-plupload-upload-ui', 'media_upload_flash_bypass' );
wp-includes/media-template.php 267
if ( 10 === remove_action( 'post-plupload-upload-ui', 'media_upload_flash_bypass' ) ) {
wp-includes/media-template.php 270
add_action( 'post-plupload-upload-ui', 'media_upload_flash_bypass' );