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Unity 2018.4.20f1 Personal - SampleScene.unity - 부갈 - PC, Mac & Linux Standalone DX11 2020-11-02 오후 9_11_18

Ensure you’re using Unity 2018.4.20f1 and the latest version of the respective SDK you chose (like SDK2 or SDK3)

Also have you at least tried restarting Unity and attempted to upload again?