File upload is not recorded using SAPGUI protocol

Hi,

I am recording a scenario in Loadrunner 8.1 using SAPGUI protocol,where I need to upload a flat file in SAP-BCS.The recording stops as soon as the window for file selection opens and resumes once that window closes.The uploading of the file part is not recorded.So if I am replaying the script is stops after opening the file selection window.How to capture the uploading of a file in the loadrunner script?

Awaiting early reply.

Thanks,
Sindhu