do unreal engine rewrite FBX files when exporting ?

let say i use blender, then i export it to UE.

when i export from UE, will it rewrite everything. so the FBX are not written by blender.

but by UE ?

Anything you export out of UE4 will be exported using UE4’s implementation of that format.

O.o so when i export with UE. Original fbx are rewritten from scratch !

quite convinient i think. So i dont have to export mesh when sell my item.