Dropzone^ADDON DropzoneJS is an open source library that provides drag’n’drop file uploads with image previews

Dropzone will find all form elements with the class dropzone, automatically attach itself to it, and upload files dropped into it to the specified action attribute. If you want your file uploads to work even without JavaScript, you can include an element with the class fallback that dropzone will remove if the browser is supported

Find in-depth, guidelines, tutorials and more on Dropzone's Official Documentation