Connecting edited videos with sound .PRV

I am new to Premier Elements video using 2020 version.  I have created a number of videos and have added sound tracks.  The are saved with the extension .PRV  How do I combine them?  I have tried importing them - won't work says error.  Tried adding the videos as media and it shows about 5 rendered clips with no attached Audio.  Each created video play perfect alone.

I'm super frustrated.  Thanks for any help you can give.

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