I have a spreadsheet, as well as a master copy of the spreadsheet. Every time user enters data into a cell, it takes the new data and throw into the master copy.
Recently however, I noticed a user creating a new column, which was not captured by OnEdit().
Hence I looked it up and saw OnChange(), which was implemented last year.
However, I do not know how to use that trigger.
How do I retrieve the new column or row, or the merged cells that the user changed, and duplicate it into my master copy? I can't find documentation on this.