The internal storage is not accessable on any Android version without a rooted device.
But you can check it using the
Filecomponent or myMFileor one of the twoFileextensions from @Taifun or @vknow360.
As I said, read the topics that I mentioned, first. And avoiding storage permissions on Android 11+ when saving the csv file (in one of the Shared folders) use my MFile extension.