Shiny Server Configuration

We have a shiny server running on the Linux server and a shiny application deployed there. To analyze some datasets all our users are pointing their browsers to the shiny application on the server and uploading data from their PCs. Is it possible to configure shiny server/app in the way so when a user is clicking on UPLOAD button in the app it is pointing him to his home directory on the Linux server? We are not running samba on the server.