Duplicating files on ipad

Hi everyone!

Today i installed TW to my ipad mini, connected to my PC and downloaded 1.46 GB videofile to ipad. To watch him, I copied it through the TW menu in the VLC player app. It turned out that the file was duplicated in both applications.

How to remove downloaded files from TW app? I didnt found this functions on menu.

P.S. The only way i found - reinstall TW app, but its not an option...