Thank you for reporting this bug. We will make it our priority to review this report.
Select the file after upload the file does not change, or the previous selected document
Select the file again to reset before
Sencha - Ext JS Dev Team
Thanks for the report, this is already resolved and should be fixed in the next release.
Twitter - @evantrimboli
Don't be afraid of the source code!
What version should I update my library, so as to remove this bug