Send attachments from on Prem Nintex form to WFC

I have an eform that is running in my on prem Sharepoint 2016 environment.  I have a step where an outside entity needs to approve a portion of the form.  I've added the start workflow in NWC control on my list and it is uploading the necessary list fields needed.  I added the attachments property to this step and connected it to a file start variable in NWC.  When I try to send this variable as an attachment in an email or task notice, there is no attachment in the message.  When I look at the instances, I can see the various items populating the start variables and for the attachments variable it only says "true".  Is there something I'm missing or is this function not possible?