Not able to add 2 additional columns into Dataflow Gen2 as the source excel file has 2 columns added

mcrreddyt - After you pulled the 2 columns into the Dataflow UI, did you remap the Lakehouse connection and table?  I've had it pick-up new columns before going through it that way.  In my case though, I'm doing an "overwrite" vs an "append" so that may cause different behavior.

I pretty much use the Notebook utilities to modify anything structural with the Lakehouse; like adding columns or repartitioning.  Its faster.