This object should be returned by the onPreUpload callback in the UploadWidgetConfig.
{}
{ "errorMessage": "Uh oh! This file failed our custom validation."}
Validation error to display to the user for this file.
The file will not be uploaded if a value is returned for this field.
Example: "Uh oh! This file failed our custom validation."
Type: String
Required: No
An alternative file to upload instead of the original file.
Required: No
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