title: Drag and drop files to be uploaded when the form is submitted
body: <p>I'm trying to implement drag-and-drop file selection for uploading files synchronously once the form is submitted. I know how regular file uploading works with HTML and PHP. And I want to be able to process the files in PHP alongside the ones in the $_FILES array.</p>
  
  <p>I've done some research and looked at several plugins but pretty much all of them either upload files once they're dropped into the window or don't use conventional html forms.</p>
  
  <p>Any kind of help like ideas, snippets or plugins would be appreciated.</p>
  
  <p>Thank you!</p>