Hi,
In addition to nmrao and richie points....
I think where we should focus is "(I tried to load excel file using data source, but that data source was not able to iterate using data source loop with return request.)".
You must have the pro version to be able to configure a data source and you should be able to iterate over each row.
Can you share an excerpt of your data source and the structure of the test? When I first tried data driven tests, I had some trouble understanding the data source loop in that you have to bind it to the data source (to create the loop), then say which is the first step inside your loop.
