How to make a warning that the user has not attached an attachment?

You have to change the rule. In the formula, you have to write a condition that is positive for your case. 

You want to have ./@size > 0. In the message field, you write the message will be displayed when a condition is not meet.

https://demo.orbeon.com/demo/fr/orbeon/builder/edit/362c167f4c1dd64125ee02fcc0d2fb7aad227267

//Jarek

wt., 16 lut 2021 o 15:22 Władysław Czaja <[hidden email]> napisał(a):

How to make a warning that the user has not attached an attachment?

I try to do it like this:

 I 

Is there any better solution?

The other problem is that if I add an attachment, the warning won't go away

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