I have created a form template in infopath 2013 which has a 'file attachment control'. This form needs to be published in sharepoint 2013. When I promote the file attachment fields I get this error 'The selected filed cannot be promoted becasuse its data type is not supported:base64Binary'. I understand the error we can't show this field as a column in document library. I have been googling around for last few days and can't find a concrete fix to the problem - some recommendations are code behind, using web service and qRules(third party) etc but have not found a proper walk through.
I will greatly appreciate any help.