When a support session is active, select File Browser to view the files and directories within the app’s sandbox. Apps are not permitted to access files outside their own sandbox, so data from other apps will never be leaked.
In the center pane of RevTwo Support Portal, the directory structure is on the left and the files in a selected directory are on the right. Each file has a download icon next to the name. Clicking on the download will put the file in the browser’s default download directory. Downloads show a progress bar and a download can be cancelled if you choose. Above the files is an upload drop area. Dragging files to the drop area will upload (send to the app) into the selected directory.