Here are a couple of ways on how you can export several 3D models at once into your game easier. As well as what you should care about when doing so.
Solution 1 exports a single FBX and uses prefabs to make the models game-ready.
Solution 2 uses a batch script to create single FBXs for all the selected models.
Blender API documentation link: https://docs.blender.org/api/current/...
Editor script to assign multiple materials from unity forums:
https://forum.unity.com/threads/edit-...
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CHAPTERS:
0:00 Intro
0:36 Solution 1
2:20 Solution 2
4:20 Assign multiple materials fix
4:45 Extra: Multiple objects models
5:36 Extra: Export collections