Why is the animation and damage not working on this knife model from toolbox?

Hi.

I know this is a bit blurry question.

I am creating my first game on Roblox. In the game the player can pick up a knife on a spawned point. I load up a test server with two players and equip the knife to one of the players, nor does the animation work or give any damage to the other player on the test server.

Is it a fact that I can't use a model from the toolbox or have to recreate the animations for the knife? Then I don't understand why there is a common library if they doesn't work and have to be customised.

I would attach the localscript and the serverscript but it is too long and not allowed to add because of that.

The current model I try to use is: 812650537

Does anyone see some clear errors why this knife don't work with no animation or damage? Or am I just a newbie that is missing some vital knowledge about how weapons work? I have now tried a-lot-of-knives ;)

Please help... this is driving me mad ;)