Thanks for giving it a try! Its very appreciated!
In the full game, when there are several books on the table, only this one will have its portal activated initially, when the optimum outcome has been reached it will
1. Unlock all the rest of the …
Found resolution. Apparently I created hotspot with 2D Box Collider, rather than just Box Collider. I'm not sure the difference but I replaced all the hotspots and working now!