Pc:
You can log into graal on pc and leave the network tab open in google chromes developer tools.
You're gonna have to look through loads of images to find it though.

iOS/Android:
The easiest way would be logging off in your house or any space without people.
Clearing your cache and then going on and as soon as the body loads log off again.
Then look through your cachefiles and it should be easy to find there.