App file backups not found for SmartTube

[c00ller]

Using the SmartTube latest version 31.94 Stable, the Files > App file backups function is unable to find SmartTube settings. In SmartTube I go to Settings > Backup/Restore > Local backup where it says the local backup will be saved in: /storage/emulated/0/Documents/SmartTubeBackup/org.smarttube.stable_xxxxxxxxxxxxx.zip
See attached screenshot.