Let's say WhatsApp app. When I try to change notification tones for WhatsApp, some ringtones show up which are not shown when I change device's notification tones.
For example in Sound Picker, only one tone named Xperia is shown when I try to change the device's ringtone whereas in WhatsApp, Sound Picker shows two tones named Xperia. There are still more like that. How can I make those tones visible for all the apps?