All images shown in the video had the same size.
So the smaller image you see tom top-left was resized using the handles directly.
For the other image, instead of resizing manually, I copied the smaller image, than I was expecting to "paste>size" on the other image, obtaining the same size as output.
However, "paste>paste size" is cropping the image, instead of resizing it.
I remember using "paste>paste size" before, having image resize as output. This is what I was trying to reach, and I'm wondering how to achieve it.
As an additional test, I created two identical shapes and tried the same process (1)copy > (2)paste>size.
It worked properly with the shapes, which leads me to think there is some issue with raster images. Maybe a tweak can change the behavior from cropping to resizing raster images?
I recorded the video again showing the full process: http://bit.ly/2SYMkc9
Cheers!