Help How correctly to make model to the character?

[casdepri]

Hello!
How to make the character save the weapon in his hand?) The HF Chronicles
format * .fbx
The model can be inserted into the hand through obj, but then the texture turns into "meat", and then the game breaks the texture into a weapon.
If this is done through max, actor, YE, it works like this, but the texture is in place:

 

PS If someone really helps with the problem, I will not regret, I'll throw off on beer / chocolate. 
And I want to learn specifically, it's not for sales. I do for myself.

 

Edited October 29, 2017 by casdepri

[casdepri]

//delete