'Why are specific files not visible when using UIDocumentPickerViewController in Swift 5.0?

For my iPhone app I am working on a file upload in the background, with progress indicator, function. So I've placed multiple files in my simulator's directory. An 8MB mp3 file, and a 22KB Excel file. In the Finder folder I see both files.

If for supportedTypes I use [UTType.item, UTType.mp3]
all I see is the Excel file, and it's selectable

If for supportedTypes I use [UTType.item]
all I see is the Excel file, and it's selectable

If for supportedTypes I use [UTType.mp3]
all I see is the Excel file, and it is not selectable

So am I missing something? And is there a type for "all" files?

case ButtType.file.rawValue:
   let supportedTypes: [UTType] = [UTType.mp3]
   let pickerViewController = UIDocumentPickerViewController(forOpeningContentTypes: supportedTypes)
   pickerViewController.delegate = self
   pickerViewController.allowsMultipleSelection = false
   present(pickerViewController, animated: true, completion: nil)

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'Why are specific files not visible when using UIDocumentPickerViewController in Swift 5.0?

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