I have found where the missing files are how do add the drives location?
In the bottom middle of the TuneSpan window, there is a Span Location area which is labeled "click here or drop folder to select span location".
So, you can click it to bring up a menu and choose "Select New Span Location..." to bring up an open dialog to navigate to your desire location, or drag-and-drop a folder from the Finder directly onto this area.
Thanks for getting in touch, please let me know if you have anymore questions.
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