title: Image doesn't display RShiny
body: <p>I am having trouble displaying an image in a Shiny app.  The code is saved in Desktop, where I also have a www folder with logo.png.  I've set the working directory to the desktop, as well:  </p>
  
  <pre><code>library(shiny)
  library(png)
  
  ui &lt;- fluidPage(
    img(src="logo.png", height = 400, width = 400)
  ) #close fluidpage
  
  
  server &lt;- function(input, output, session){
  
  } # closer server
  
  shinyApp(ui=ui, server=server)
  </code></pre>
  
  <p>Here's how the output looks.<br>
  <a href="https://i.stack.imgur.com/XU9Yj.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/XU9Yj.jpg" alt="enter image description here"></a></p>
  
  <p>I prefer to have server and ui in the same file for ease of understanding.  Perhaps that is the issue?</p>