Script will take more time for Executing?

We have one scenario for uploading 100 files.
This scenario will take almost 10 minutes (Manually).

While running script in check Virtual User It's take almost Four Hours, Files are Uploaded Successfully.

In our application back end services able to establish almost 16 connection's at a time for uploading.

Neoload Page Level Advance setting tab In Parallel option also tried but it's also take same time Four Hours.

In Neoload is there any option for executing number of request at a time?

Thanks,
Chinnikrishna.