9)    How can we access the Files we uploaded to a form ? And how do I know to which form / SessionID this was uploaded?

9)    How can we access the Files we uploaded to a form ?

And how do I know to which form / SessionID this was uploaded?

You can view your submissions as well as their associated file uploads from the submission view in your account:

http://www.jotform.com/help/269-How-to-view-Submissions

The files will be attached to the submission they were uploaded with.  The files must be accessed through the submission they were attached to.  The submission ID will be the same always and you can reference that number or the submission data, in order to view the associated file.