As you can see, below are screenshots. The first one came from this video https://drive.google.com/file/d/1X9loKHE1Mi0N3oCKVxh5Eg6KV7S6s7km/view?usp=sharing and on the right side is the UV editor. So when he selects all the boxes in edit mode and select project from view all the cubes appear in the UV window but when I try that, only one cube appears even though all the cubes in edit mode are selected. No matter if there are 10 or 1000 cubes selected, the same cube is selected in the UV view and in the same place and rotation. All my cubes are copies from one original cube, so maybe that's why in UV view I only see the one cube selected. Maybe because I used a box and used the particle properties and filled the volume with the original object. I did that because that was a fast way to make duplicates, and also I can easily randomize their rotation and position. If there is another way I can do that besides an array, because I can't seem to get a scatter and random rotation effect with the array, let me know please.
I just noticed this. My original cube is not selectable and off the scene. So when I select only the cubes in the middle of the screen and enter edit mode and select all. It will for some reason select the original cube???