Are dependencies duplicated in size/memory?

Example:

  1. adding a folder of files to addressables and building it
  2. one of files in above folder references other files from same folder.
    Result:
    Are these files loaded twice in memory? OR in disk size?

I recommend to use Unity’s built-in Memory Profiler and take a “Detailed” snapshot from your build (not in the editor). This is the most reliable method to find whether assets are duplicated in memory.
https://docs.unity3d.com/Manual/ProfilerMemory.html

Alternatively you can use more powerful but also more complicated tools such as Unity’s Memory Profiler package:
https://docs.unity3d.com/Packages/com.unity.memoryprofiler@latest

Here I would take a look at the Addressables Analyze tool:
https://docs.unity3d.com/Packages/com.unity.addressables@1.1/manual/AddressableAssetsAnalyze.html

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