Why can't the content://media/external/file have Primary directory Audio and only [Download, Documents] directories are permitted? - IllegalArgumentException.

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This is because the content://media/external/file URI is specifically designed to access files stored in the external storage directory of a device. The external storage directory contains several sub-directories including Download, Documents, and Audio. However, the Audio sub-directory is not a primary directory, and therefore cannot be accessed directly using the content://media/external/file URI. Instead, you would need to use a different URI or method to access files within the Audio directory. Attempting to access the Audio directory using the content://media/external/file URI would result in an IllegalArgumentException.