First of all thanks for adding validation to drop-zone.
Unfortunately there is no real support for native AC Validation messages, we just get a basic alert. Also, if using Max Total File Size, the user has to click the alert for every selected file, but he doesn’t know that as there is no information.
The validation should be implemented in a more user-friendly way, like add all the images to the drop-zone but prevent submission of the form and show the alert message/total file size next to the form field. Then the user should be able to decide which file he wants to remove and the total file size should dynamicly being updated.
And please also implement dynamic value support as we maintain all these values in our CMS from database values, not static values. Thanks!