I’ve come across a minor issue that caused me some head scratching… if you have an image element, and you type the name of your image in the wrong case, then the SIMULATOR will work correctly (your image will be shown), but on an iOS or Android device it will not.
So, for example, if my image is Light.png and if I set my image property incorrectly to light.png then the simulator picks up the image, but devices do not.
Took me a while to figure out why my iPad and android behaved differently to the simulator, so might annoy others. Heads up.