Dynamic Multi File | DropZone

Enable Handler
form_builder:
dynamic_multi_file_adapter: OpenDxp\Bundle\FormBuilderBundle\DynamicMultiFile\Adapter\DropZoneAdapter
Configure Library
Learn how to configure this extension in frontend here.
Field Configuration Notes
With DropZone you need to use the mime type in Allowed Extensions configuration. Example: image/jpeg,image/png,image/gif,image/jpg,application/pdf