I cant Package my project for android, It just opens the unreal documentation website

Development Platform & Builds Mobile
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What worked for: I ran SetupAndroid.bat, then UpdateLinker.bat from Engine/Extras/Android.

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This video helped me: 4.25 Installing & Building to Android (VR/AR/Mobile) UE4 / Unreal Engine 4 - YouTube

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Android packaging is generally buggy.

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Deleting the intermediate folder worked for me in 4.24 and 4.26