Attaching Files to SmartObjects via InfoPath
An infopath file attachment field can be directly tied to the content smartobject field. The Name parameter is optional and in my tests will get populated with the file name when no value is supplied.
I hope that helps.
-Eric
It worked for me in my test but it was a very simple test.
Sorry for the delayed reply.
You wouldn't need to have a smartobject field for the file because you could just have the main infopath datasource hold the attachment and it will get passed to the approver. If the file attachment is large and you don't want it stored as a part of the form then you could use a smartobject field to represent the attached file and only load it when necessary.
-Eric
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