It supports image thumbnail previews, progress bars, multiple files, synchronous uploads and has many customization options.
The extension also includes a built-in PHP script to handle the server sided part of the upload.
Demo
https://wysiwygwebbuilder.com/support/dropzone/dropzone-demo.html
More information
https://www.wysiwygwebbuilder.com/dropzone.html
You can also download the new extension via the Extension Manager: Menu->Tools->Extension Manager->Online Gallery->Forms
This extension is from my private collection. It is provided "AS IS".
Please read the included documentation for help.
https://www.buymeacoffee.com/wysiwygwb