How can I customize the validation for file uploads in Episerver forms?

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You can customize the validation for file uploads in Episerver forms by following these steps:

1. In the Episerver Forms editor, select the file upload field that you want to customize validation for.
2. In the properties panel on the right-hand side, navigate to the Validation section.
3. Click on the Add link to add a new validation rule.
4. Select the type of validation rule that you want to add. For example, you might choose the File Size validation rule.
5. Configure the validation rule by setting the desired parameters. For example, you might set the maximum file size to 1 MB.
6. Save the form.

You can add multiple validation rules to the same file upload field to ensure that all necessary criteria are met before the file is uploaded. Additionally, you can customize the error messages that are displayed to users when a validation rule is not met. To do this, navigate to the Messages section of the properties panel and edit the appropriate error message.