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What's the best way to delete unused materials, textures and 3d meshes?

What’s the best way to delete unused materials, textures and 3d meshes?

There are various utilities that do this sort of thing on the marketplace ( can’t find one right now ).

But if you want to keep your package size down, make a new project and migrate your maps to it. That way only the stuff used by the maps will be transferred.

EDIT: Assets Cleaner - Project Cleaning Tool in Code Plugins - UE Marketplace