This worked on my new S21plus. I use Textra texting app. Wanted to have my own notification sound, but there was no "Ringtone" option. Instead, bottom line said 5 categories deleted. But app needs access to "Storage" in order to work. I found this solution on another forum: " go into settings > apps > 3 dots upper right corner tap it > go to reset app preferences". "Ringtone" now appears, can set any desired ringtone for text notifications. IT WORKS!!!
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