Audio files

Someone help me here.  Why is it when I import audio files to the slides, then save my PPT, when I come back in- the audio files I've added are gone?  I exported the file to watch my presentation, and the audio was not there on some of the slides....Same PPT, never working on another version, simply not saving the audio files that I put in there (Mp3s).  I don't understand at all here...

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