magento-test/app/code/Magento/Cms/Test/Mftf/ActionGroup/DeleteImageFromStorageActionGroup.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
 /**
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
-->

<actionGroups xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:noNamespaceSchemaLocation="urn:magento:mftf:Test/etc/actionGroupSchema.xsd">
    <actionGroup name="DeleteImageFromStorageActionGroup">
        <annotations>
            <description>Deletes the provided Image from Storage.</description>
        </annotations>
        <arguments>
            <argument name="Image"/>
        </arguments>
        
        <waitForElementVisible selector="{{MediaGallerySection.imageOrImageCopy(Image.fileName, Image.extension)}}" stepKey="waitForInitialImages"/>
        <grabMultiple selector="{{MediaGallerySection.imageOrImageCopy(Image.fileName, Image.extension)}}" stepKey="initialImages"/>
        <waitForElementVisible selector="{{MediaGallerySection.lastImageOrImageCopy(Image.fileName, Image.extension)}}" stepKey="waitForLastImage"/>
        <click selector="{{MediaGallerySection.lastImageOrImageCopy(Image.fileName, Image.extension)}}" stepKey="selectImage"/>
        <waitForElementVisible selector="{{MediaGallerySection.DeleteSelectedBtn}}" stepKey="waitForDeleteBtn"/>
        <click selector="{{MediaGallerySection.DeleteSelectedBtn}}" stepKey="clickDeleteSelected"/>
        <waitForPageLoad stepKey="waitForPageLoad1"/>
        <waitForElementVisible selector="{{MediaGallerySection.confirmDelete}}" stepKey="waitForConfirmBtn"/>
        <click selector="{{MediaGallerySection.confirmDelete}}" stepKey="clickConfirmBtn"/>
        <waitForPageLoad stepKey="waitForPageLoad2"/>
        <waitForLoadingMaskToDisappear stepKey="waitForLoadingMaskToDisappear"/>
        <grabMultiple selector="{{MediaGallerySection.imageOrImageCopy(Image.fileName, Image.extension)}}" stepKey="newImages"/>
        
        <assertLessThan stepKey="assertLessImages">
            <expectedResult type="variable">initialImages</expectedResult>
            <actualResult type="variable">newImages</actualResult>
        </assertLessThan>
    </actionGroup>
</actionGroups>