FileAttachmentUpload widget saying to attach file after I've attached one

Content

Hi,

Using the below setup, when I attach an image and try to submit the form, I get the error:

You need to fill out the 'Attach Documents ' field

I can't see why this would be - I am sure it's to do with /ci/fattach/upload but I can't put my finger on it. We had a similar issue before and again, for the life of me I can't remember how we fixed it.

Any ideas or do you need more information?

Form

<form id="rn_QuestionSubmit" method="post" action="/cc/AjaxSubmit/Request">

Input Widget

<rn:widget path="input/FileAttachmentUpload" valid_file_extensions=csv,xlsx,xlsm,xltx,xltm,docx,docm,dotx,dotm,docb,doc,msg min_required_attachments='1' />