Question: how to download ringtones on a samsung galaxy s8?
Answer: From a Home screen, touch and swipe up or down to display all apps. ... 
Tap Messages. ... 
Touch and hold the ringtone file.
Tap Save attachment.
Tap (check) the appropriate attachment(s) then tap Save.
Tap the Back icon. ... 
Tap Samsung folder then tap My Files .
Tap Audio then touch and hold the file.