magento-test/app/code/Magento/MediaContentCatalog/etc/events.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="catalog_category_save_after">
        <observer name="media_content_catalog_category_save_after" instance="Magento\MediaContentCatalog\Observer\Category" />
    </event>
   <event name="catalog_product_delete_before">
        <observer name="media_content_catalog_product_delete_before" instance="Magento\MediaContentCatalog\Observer\ProductDelete" />
    </event>
   <event name="catalog_category_delete_before">
        <observer name="media_content_catalog_category_delete_before" instance="Magento\MediaContentCatalog\Observer\CategoryDelete" />
    </event>
    <event name="catalog_product_save_after">
        <observer name="media_content_catalog_product_save_after" instance="Magento\MediaContentCatalog\Observer\Product" />
    </event>
</config>