I need to Export FBX "MEDIA Embedded" from Unity, Please Help,I want to Export FBX from Unity With EMBEDDED TEXTURES, can you Guide

I need to optimize Super Heavy Environment From Unity that Contains Lots of Custom Shaders & Textures It is Practically over 50 Shaders it will be helpful if I am able to Embed the Textures in FBX from Unity,I want to Optimise Models from Unity Scene in Maya but due to Lots of Custom Shaders & Textures in Unity, I will not be able to optimize in deadline