How to integrate upload file with my form

[eluser]cybersven[/eluser]
Hi,

I'm new to CI and I would like to integrate in an existing form, the upload file.
Before that I've tested the upload from the documentation and it works,
now I've downloaded a complete example form and it works well, so I'm trying to integrate the upload without success, could you help me ?

Here is the controller : https://docs.google.com/document/d/1JtQu...sp=sharing