@DPR

Widget Behavior and Limitations:

The Constellation Attachment widget is primarily designed for ad-hoc attachments, allowing users to upload files without extensive validation.

Unfortunately, out-of-the-box, there isn’t a direct option to set custom error messages specifically for this widget.

Alternative Approach:

Since the widget’s rules are final and customization options are limited, consider an alternative approach:

Use an Attachment Field in the Data Model:

Instead of relying solely on the Constellation Attachment widget, create a custom attachment field in your data model.

This custom field allows you to build a more guided attachment experience with additional validations and custom error messages.

You can define your own logic for error handling and display relevant messages based on business rules.