Attachments Disappear from list / from (edit mode)

Canvas Initiate
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Nintex form - Incorrect validation rule making Attachments disappear (or overwritten).

I had an interesting issue raised today by one of the customers I deal with regularly and thought I would share here.

Why is the attachments added to the list via the nintex form being removed or over written?

After wracking my brain (and google) I did not find an answer.

Taking a step I went through the form validation rules I found two of them had been incorrectly configured (using the isNullOrEmpty Runtime Function).

INcorrect configuration of isNullOrEmpty runtime

Once correcting the validation rule, the attachments stayed in the form / list.


I hope this helps others out there who are struggling with this.