RT 3.8.4: Mandatory Fields: Can attaching a file be made mandatory

RT Users
1

Hello,

I create a custom field of type “Upload one file” I set Validation to
(?#Mandatory).
Then I enable this CF in a queue.

When trying to create a ticket in this queue, I upload a file in my custom
field, tried with .doc, .gif and .txt.

When I click on Create ticket I get the error message at the top of the
page: “CF name”: Input must match [Mandatory].

My question: How do I make attaching a file mandatory?

Thank you,
Ina

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