Gut instinct with nothing to back it -- can you give me exactly what is in the form fields at the time you click the submit button?

Where I'm going with this: It seems fairly likely that it is opening the file and then dying for some reason, thus leaving you with an empty file. Perhaps it's having trouble parsing the input filename, in some manner which is not made visible to you despite all the wonderful efforts in the example to get the errors back to you; or once opened, it is having trouble finding a channel back to the input data from your file.

If nothing pops out at me with your supplied data, maybe I can spin up a quick version of the file uploader as you have done and troubleshoot it from this side.

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