For Android, a little bit easier--
you're going to have one directory with all
of the files of interest.
So here, we can see we have kik.android.
However, you could have an SD card or a media directory
as well.
On iPhone, other than Instagram, most of the apps
containerized or keep all of the pictures
within the shared or the app group directory.
So you have those two different paths you could look at.
But on Android, most of the attachments or pictures
or videos, MP4s, are going to be stored either in the media
directory or on the SD card.
Again, if you search for Kik, it would have found it
in both of these examples.