You have to define the path where the sound should be saved beforehand (before starting rec). Set the absolute path: /storage/emulated/0/...
It would be best if you save in the ASD now, as this will be necessary from Aug / Nov 2021 when Kodular targets Android 11.
Btw, no need to ask for permissions, these are requested automatically.
Note: → @pavi2410 The red crossed out part should be removed:
