ISOMETRIC GAMES photon problem

Hello.

I am stuck because I wanted to make an isometric game where the player should be able to detect if he should pass behind or in front of the object.

I started to follow this tutorial : construct.net/en/tutorials/isometric-games-object-layer-1321

except I noticed that it does not work.

because after some research I understood that my photon server was the source of the problem.

I cannot explain the why of how I tried to call a photon event to perform the conditions and actions.

apart from that it doesn't really work.

here is some screen :

I noticed it warns of how I am creating a new character.

except I am obliged to create a new character I cannot go through an instance.