Need help understanding many use cases in ionic push



I have few questions related to ionic push notifications.

On android:
one push replaces the existing. I have tried every possible combination of a unique id in push params but all failed.
if I need to send an image in push (not the icon but bigger image along with the push), I couldn’t find any solution to that as well

On iOS:
I need to figure out a way to send an image along with the push.

Please help