如何在R中的ioslides_presentation中放置多个徽标？

Question

我刚开始在R中制作ioslides_presentation。我想在标题页中插入2个徽标，有什么办法可以做到？非常感谢您的帮助。

这是我的代码发生错误。

---
title: "Title"
author: "Name"
date: "December 6"
output: 
  ioslides_presentation:
    incremental: true
    # If I put only 1 logo image, it works.
    logo: "C:/Users/kenta/Dropbox/Logo/logo1.png","C:/Users/kenta/Dropbox/Logo/logo2.png"

---