All file transfers (either successful or unsuccessful) are logged, however they are not shown in the recorded sessions themselves.
To see file transfers for a session:
1. Log into the /TPAM interface, and select "Management" | "Session Mgmt" | "Session Logs"
2. Click the "Listing" tab, and select a recorded session where file transfers were performed
3. Once a recorded session is selected, click the "File Transfers" tab
The above should show the files and times when transfers were performed.