File upload "is empty" error on submit

[mcculloughi]

Issue Overview

I think I found a bug in Gravity Forms Pods Addon dealing with File Upload.
I have a "song" form where a user uploads an mp3. It works by itself just in Gravity Forms. A user can upload and it will show in the Gravity Forms entries. However, when I add the pods feed and map it to the "file" field in my Song Pod, I get an error. On form submit, I am getting a white screen and a simple error statement "File is Empty" where "File" is the Pod's field's name. Been trying all sorts of settings combinations with no luck.

Expected Behavior

I expect the file to be inserted into the pod via the feed and the form to be submitted

Current Behavior

the form does not submit, the "error" is shown on a blank white background

Possible Solution

Steps to Reproduce (for bugs)

1. Create a gravity form with a file
2. Create a pods feed for the form
3. Map the file field to a corresponding pods file field

Form Upload

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