Anche io ho questo problema
Ciao piero1962, bentornato sulla Community Samsung!
Ho eseguito una verifica e mi risulta che la procedura indicata da Deb23 sia corretta: in questo modo, infatti, puoi scegliere una suoneria per ogni singola app. Sei riuscito a procedere in questo modo? 
Facci sapere se riscontri eventuali difficoltà o se hai dubbi!
Ciao
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