Delete all unused assets

It is already inside UE4 Editor, although it is not exactly one button ‘cleanup my assets, please’

  1. Create a new project (this is supposed to be the clean project with all needed asset)
  2. Inside UE4 Editor, working with existing project (which has many unneeded asset), select a level and then right click, Asset Action -> Migrate.
  3. Migrate to the new project just created (select the Content folder).
  4. The migration will copy all referenced asset to the new project
  5. Repeat for all levels.
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