Can't change "Twitter Mobile Notification ringtones"...app. is N/G

I cannot choose/change my Twtter "Mobile Notification Sound" on either My Verizon Samsung Galaxy 6 or my Verizon Iphone 6.....Always goes back to "Default Sound"...

I already re-installed app....did Update...Nothing.

is the Twitter App broken? any ideas?
thx
Gail T.

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