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The feature of adding a progress bar has previously been requested, and a ticket has already been sent to our Develolment Team. Unfortunately there is not an implementation of such request at this time.
Nevertheless, I would suggest to try setting the File Upload tool to multiple file uploads as this allows you to display the transfer percentage.
To set the Muliple file upload feature:
On the Properties of the File Upload Tool select Allow Multiple:
Multiple File Upload Tool - Thread