Reducing Android build size. What is data.unity3d?

Unity Engine
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1

My APK for my android build is 900mb (350mb for desktop version). The largest file is data.unity3d in assets/bin/data at 800mb.
How do I see what is causing this massive size?
How can I go about reducing this?

Googling around all the threads seem to be about going from 20mb->16, my issue is probably something else but if anyone knows of a thread about massive sizes then please do link them!

2

It’s your player data compressed using LZ4 compression. You can select compression in Build Settings window. Default usually gives the smallest apk, but is slowest to load.

3

Thanks Audimas, to answer my own Q, it was mostly all my Images which were not power-of-two. The size is massively inflated on an android build for textures like this.