Yes, But it should update the B Column since Unique IDs are the same in CSV as well as Google Sheets as per your first post, which was very useful. When more than 400 rows are added it is not working. Guess need to work more on it. A video of the sam...

I Also tried the feature. I went step by Step to see where i was going wrong. Added only 2 Columns - One unique ID and 1 no column. I added till 400 rows step by step and went fine with the CSV Upload. Then when i added 401 row, it said Action failed...