Lost audio in engage

Hi, I'm new to this forum so be patient with me! I have recorded my course and it includes powerpoint slides and engage interactions. When I put it through to publish, the audio on the engage interactions vanishes - the ppt audio is ok. Both are ok if I use the preview. After looking at other queries on this topic I checked the firewall and mp3's are unblocked. Any other ideas?? All help appreciated!

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