title: Upload a user picked directory in R Shiny
body: <p>I have an R shiny app that requires multiple files (all found within the same folder) to be uploaded. I also know the names of the files to look for.</p>
  
  <p>Is there any way to upload these files other than via <code>fileInput(..., multiple = TRUE)</code>? Ideally, I would have the user upload the whole directory.</p>