magento-test/app/code/Magento/Cms/Test/Mftf/ActionGroup/AttachImageActionGroup.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="AttachImageActionGroup">
        <annotations>
            <description>Uploads the provided Image to Media Gallery.
                If you use this action group, you MUST add steps to delete the image in the "after" steps.</description>
        </annotations>
        <arguments>
            <argument name="Image"/>
        </arguments>

        <waitForElement selector="{{MediaGallerySection.BrowseUploadImage}}" stepKey="waitForUploadImageElement"/>
        <attachFile selector="{{MediaGallerySection.BrowseUploadImage}}" userInput="{{Image.value}}" stepKey="uploadImage"/>
        <waitForPageLoad stepKey="waitForPageLoad"/>
        <waitForPageLoad stepKey="waitForLoadingMaskToDisappear"/>
        <waitForElementVisible  selector="{{MediaGallerySection.imageOrImageCopy(Image.fileName, Image.extension)}}" stepKey="waitForUploadImage"/>
    </actionGroup>
</actionGroups>