you set the upload behavor to use the upload success trigger, use the upload success trigger on the UE Behavor, not the upload beahvor.
also in the update record behavior, you have a redirect, this will prevent the UE behavior from executing
edit the Upload behavior and set the trigger to any form post
edit the update record behavior and clear redirect
edit the UE behavior and set the trigger upload file success. set the Go To Page to go to the thank you page.