I was trying out the image functionality of the spreadsheet and it doesn't seem to work properly.
For some images it seemed like nothing happened after insert; however, that wasn't true, as for other images that have a background color, it became apparent that the image is somehow being inserted/drawn at a huge scale, essentially stretching offscreen for thousands of rows and columns. I had images that were less than 100 px square and they still get blown up to an enormous size.