public/scripts/extensions/attachments/move-attachment.html

<div class="flex-container justifyCenter alignItemsBaseline">
    <span>Move <strong class="moveAttachmentName">{{name}}</strong> to...</span>
    <select class="moveAttachmentTarget">
        {{#each targets}}
            <option value="{{this}}">{{this}}</option>
        {{/each}}
    </select>
</div>