You can add a File List context block in the On Change event:
After that, information about the files uploaded to the
Dropzone component is placed in the File List context block in the On Change event. If there is an error loading a file, details of the error can be found in the errors property of the particular file:
If the error occurred not due to component validation but during the upload process, the On Upload Failed event will help:
Regards,
Volodymyr