public/scripts/extensions/attachments/files-dropped.html

<div class="flex-container justifyCenter alignItemsBaseline">
    <span>Save <span class="droppedFilesCount">{{count}}</span> file(s) to...</span>
    <select class="droppedFilesTarget">
        {{#each targets}}
            <option value="{{this}}">{{this}}</option>
        {{/each}}
    </select>
</div>