Nintex Newbie

Required 2nd attachment control based on choice field (radio button) selection

Hi everyone!  I've tried searching and couldn't find anything, so I'm posting.  I apologize if I missed this someplace else on the forums.

SharePoint 2013 using Nintex Forms.  I have multiple attachment controls.  One of the controls will be required no matter what, easy and done!  The second attachment control will only be required if they make a specific selection on a choice (radio button) field.  The controls will also be hidden unless the choice selection is made, also easy and done.

If I use the control settings to make it required, it is required even when hidden.  I can not for the life of me figure out how to create a validation function to make it required based on the choice field.

Any help is greatly appreciated.  Let me know if you need any additional information!

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