Based on the watermarking video, it seems that your interface is actually sort of 3-dimensional? Meaning that a single column (watermarking in the video I watched) represents multiple underlying steps? I feel like to fully leverage the spreadsheet UI you need to explode that view out so the row more clearly represents each sub-step in a column?

Also: are there conditionals? So you can skip a step/column if not needed, or repeat as many times as needed?