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Android Build a Self-Destructing Message Android App Capturing Photos and Videos Setting Where Photos are Saved

Is it common practice to store pictures and videos in the public storage pictures directory?

// 1. Get the External Storage Directory
            String appName = MainActivity.this.getString(R.string.app_name);
            File mediaStorageDir = new File(

It seems we are only concerned with the pictures directory although we are also storing videos. What is the videos directory used for then? Movies?