No camera / images on Android build

Hi, everyone!

Before anything, I have looked for the solution for this problem but I did not find it.

I builded a simple project: an image and a button. When I build on windows platform everything (now) works fine. But when I build on Android, after instaling the APK on Android, the screen just show me a blue screen; no image, no button.

What do I am making wrong?

My settings:
Unity 2018.1.1f1
Java jdk1.8.0_181
SDK 25.2.2
API Compatibility level .Net 2.0
Runtime version .Net 3.5 equivalent

Here some link that I read:

I have found the solution: simply set the Canvas Scaler (UI Scale Mode) for Scale with screen size.