magento-test/app/code/Magento/Downloadable/Test/Mftf/ActionGroup/AddDownloadableSampleUrlActionGroup.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="AddDownloadableSampleUrlActionGroup">
        <annotations>
            <description>Clicks on 'Add Link' under the 'Samples' section. Fills in the provided Downloadable Sample URL details.</description>
        </annotations>
        <arguments>
            <argument name="sample" defaultValue="downloadableSampleUrl"/>
        </arguments>

        <click selector="{{AdminProductDownloadableSection.samplesAddLinkButton}}" stepKey="clickSampleAddLinkButton2"/>
        <waitForPageLoad stepKey="waitForPageLoad"/>
        <fillField userInput="{{sample.title}}" selector="{{AdminProductDownloadableSection.addSampleTitleInput('1')}}" stepKey="fillDownloadableSampleTitle"/>
        <selectOption userInput="{{sample.file_type}}" selector="{{AdminProductDownloadableSection.addSampleFileTypeSelector('1')}}" stepKey="selectDownloadableSampleFileType"/>
        <fillField userInput="{{sample.file}}" selector="{{AdminProductDownloadableSection.addSampleFileUrlInput('1')}}" stepKey="fillDownloadableSampleFileUrl"/>
    </actionGroup>
</actionGroups>