How to capture E-signature authentication in test tool

I'm doing a performance test, for a report upload system of a bank, using the test tool LoadComplete from SmartBear, and here I'm having this problem: After I upload the file, system will do a security check, it's using e-signature, with an USB key and the program SafeNet authentication client. I can record the uploading of the file, but after upload, there's a window of SafeNet Authentication client to insert a provided password, let's say abcd1234.

LoadComplete can't record the authentication part, therefore, when I run the scenarion, the file can not be successfully uploaded. The password abcd1234 seems like being processed by SafeNet Authentication client, I couldn't find that string abcd1234 in any request captured by both LoadComplete and the browser.

So, my question is, how to capture that authentication part with LoadComple? Or in another words, I need to upload the file through LoadComplete successfully.

Thank you so much for reading my question. Best wishes.