Mark --
Thank you very much for your prompt reply. However, I think there may have been a misunderstanding of what we're trying to accomplish. According to the API documentation, the "skip_duplicates" tag determines whether or not "existing people will be ignored". What we're trying to do is actually merge matched records (see attached screenshot). Basically, I can find no tag within the Imports controller that handles this particular feature (a feature, that as you can see by the screenshot, is available when we upload a file manually using the StreamSend website).
FYI, just to be sure, I did go ahead and try using the "skip_duplicates" tag (setting it to both TRUE and FALSE) and it made no difference in whether or not matched records were merged or not.
Can you please assist?
Thanks again for all your help!
--mark