I am unable to use a custom notification sound for Textra on Samsung S22 ultra running Android 13, One UI 5.0 and Textra 4.59. I select a ringtone within Textra/Settings/Customize Notifications/Android Settings. The sound I chose is from Zedge "Airbus Seatbelt Sign" but when an incoming Textra message arrives, I hear the default system sound "Ping". I did not have this problem with my Note 10plus running Android 12, UI 4.1 and Textra 4.56.

Are you aware of this bug?

For now, I've changed the default system sound to "Airbus Seatbelt Sign", but now other system notifications make me check for incoming Textra messages...