Project doesn't load on Android, displays pitch black background

The project doesn’t seem to load on mobile (Android) very consistently (it would often fail on my Huawei P20 Lite, but work on subsequent reloads). When it fails to load, after the loading screen disappears, all I’m left with is a black background and literally nothing else. (Pure black, not even the loading screen’s dark blue)

I had something similar happen in another scene (TEMPLATE Instructor), where certain textures I used in the UI would not load and display as white squares.

Is this a memory problem? Is too much being loaded and the device is out of RAM? I can’t really think of any other explanation for these problems, but the project’s just 14 MB. Unfortunately googling didn’t yield any results.