Mark,
Based on your last reply, it looks like you are trying to create a file with the desired resend message. This is not required if you are resending through smat. Just select the actual message (using the toggle “select” toggle button) and then resend by clicking selected/resend menu item. As Daniel indicated above, select the inbound thread name and IB Pre TPS. The last screen print you posted looks like you sent it via OB post TPS. That would sent the message BACK to the source system.
If you choose to select and create a resend file, the created file will need to be sent via the actual thread on NetMonitor. Right click inbound thread and select “resend”. Feel free to email me if my reply is confusing. My replies will confuse me at times..🙂 Hope this helps.