You really shouldn’t “send” the files Published to a local folder to “preview”. Webpages are designed to be severed by a web server. Although many plain html pages can be viewed by a client locally things like PHP files and some links won’t work and will make the site appear broken. You’ll probably make a bad impression with the client.
It’s always best practice to have a user acceptance URL on a test domain or sub domain for the client to see and approve the site.