public/scripts/extensions/attachments/attach-button.html

<div id="attachFile" class="list-group-item flex-container flexGap5" title="Attach a file or image to a current chat.">
    <div class="fa-fw fa-solid fa-paperclip extensionsMenuExtensionButton"></div>
    <span data-i18n="Attach a File">Attach a File</span>
</div>