As Eric said, if you tap on the error it’ll give you more info. Have you tried a different image? Some instances impose a maximum file size on the images you can upload. If that happens, it’ll show the “error” toast. We’d like to make that error case show a more obvious warning in future.
I’m not sure what you mean by this. Could you elaborate please? There is a back button at the top of the screen here:
Yeah, we aren’t happy with it either. Unfortunately adding a border to those elements isn’t simple to do - Apple really doesn’t want us changing the appearance of forms. We’ll try to come up with a better solution before 2.0 release. No promises though.