Drag files out of the box to remove from the input
Drag files between multiple `filebokz` elements
Files are all managed with the `file` input, so they are submitted with your form and AJAX isn't required (however you can definitely use it if you wish)
Preview images before they are uploaded to your server (and specify images or HTML content to display for files that aren't images)
Specify allowed file extensions, max number of files, max individual file size, and max total file size, as well as the error messages that are displayed when those rules are broken (however you'll definitally want to implement some server-side validation)
Pretty much everything is configurable and flexible