The column names have to match exactly for the data from file to be added to the extract. This includes case, spaces and other characters.
Hope this helps!
Thank you, Tracy. Is there a way to manually link the existing columns to those in the newly added file, even one by one? Since IT people sometimes change fields' format and name when pulling out data, I may expect more fusses in the days ahead......sadly.
Thanks, Shawn. Yep, I then used replacing reference function. -Li