Aidy, me again. Going through this tutorial has shown me what might possibly be causing the issue I had with the UV editor in the last tutorial. Here after painting you say to tab into edit mode and then back to paint mode. To see it in the UV editor. When I do this the image in my UV editor stays to the last image loaded. With my UVs overlaid from this cube. The image does not change even when selecting other objects.

I had to manually select the correct image.