Use new "scope" properties File

MIT App Inventor Help
3

After targetSdkVersion=30 you can no longer create your own subdirectories in the root dir of the external storage on Android 11+ devices. (Note: this is also not possible using SAF.)

But you can do it in one of the Shared folders like

  • /Documents
  • /Download
  • /DCIM
  • /Pictures
  • /Music
    ...

See also here:

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