Sound files won't copy/paste into different .story file

I have two similar projects I am working on. Some slides are the same so I did one recording in Project A and figured I'd copy/paste the sound file onto Project B slide. It worked once with no problems but now it won't let me do it anymore. The copy/paste completes with nothing moved. It even adds a name and slot in the timeline but it's empty. 

I exported the sound file from Project A and inserted it into Project B's slide BUT the sound quality is horrible! I sound as if I'm underwater or in a mine shaft. Please help.

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