[MDL ED] Entities into Items

[noovra]

Hello there!

I'm working right now on my custom story, but I'll need some help.
Someone has posted a thread about a topic, that's similar like this one. I know how I can make an entity to an item with the "Model Editor", but the problem is, if I start the game I can't pick this item up.
Maybe.. someone can told me, how I have to save the finished version of the item in the "Model Editor", because I just saved it in the normal "entities" of the "Amnesia The Dark Descent" folder.
Like: Amnesia The Dark Descent / entities / gameplay / ladder_moveable

The item is ingame right there, and also it'll indicated as ones, but I can't interact with it.

I'm very thankful for reading, and also thank you, to spend your time with it.
I was actually not the best man in english at school, so... I hope my message is readable.