Z2 Force, upgrade to Android 8.0.0 (Oreo) 14GB in memory just for the OS, is too way much.

Please need help, i just bought my brand new Z2 Force, when get the upgrade to Android 8.0.0 (Oreo) i watch the storage device, notice i say is brand new, i even install any other apps, only whats app, an now i have 14GB in memory just for the OS, it's any other way to get a light weight version of android, because 14GB is too way much.
Cell specs: Z2 Force 64GB 6 RAM (i still think 14GB is too much)

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