I used Export & Share > Device > Computer to export my video (MP4) (single images & wav files). Images look great, but NO audio can be heard. In Premier, sound is fine. I don't know what to check.
John, Ann and Steve have all posted, so I can't resist trying to add something of my own.
Long ago, one of the frequent posters here was Bill Hunt. I forgot what my audio problem was, be he suggeted that the Voice track was for voice recorded with Premeier Elements, the Music Track is for music from the Premiere Elements music generation system and all audio media added from outside the program (MP3s, WAVs) should be on a numbered audio track. Sometimes that meant that the primary video track should be on Video 2 so that the external music could be below it on Audio 1.