APK build stops working for specific device - any pointers?

I have the following issue:
My app was able to compile and build to all of my android devices:
Samsung j5 running android 7.1.1
Galaxy Tab A running android 8.1.0
Samsung a8 running android 9

Somewhere during the development (I know the git commit that breaks this)
the app stops being able to work on the a8 running android 9.
Im trying to pinpoint which of my changes cause the apk to break for just this device and not the others.

Going through the commit it mostly has the following type of changes:
Adding images/textures
Adding 3d Models
Making new materials
Making prefabs out of the above mentioned
Writing some code scripts
Adding/updating custom mobile shaders to highlight items and enable backface view on some objects (removing these did not fix the issue)

If anyone has any pointers/ideas on general causes of this i'd love to hear them.

 

nevermind, the issue was apparently that the phone's storage was near full..