something on the live server is peventing the file upload from working.
To troubleshoot, use the insert page. edit the insert record behavior and remove the redirect to the results page. Set it so it will not redirect after inserting a record.
then add the following code at line 1:
also on the bindings panel, expand the Uploaded Files Global status binding group and add the debug info binding to the page.
post back the debug info, any php errors and a copy of the page after running a test.