Photoshop express: how do I retrieve my photo...once I've done some changes ?

When you tap save after making changes, it will save them back to your camera roll on iOS (iPhone, iPad, or iPod), it will save them to your Photo Gallery on Android.

Actually it doesn't save to your gallery. Oh it claims that it does but only the original unedited photo remains in the gallery. I have to post my edited pics to Facebook and then download them from there. I have an android phone running the latest version of the Android os.