How I work cases like that:
1.
Manually select a different audio clip on each slide
2.
If the syncing with the animations has to be very precise: add bookmarks to the audio files (Playback tab > Add Bookmark) and trigger the animations to those bookmarks (select animation in animation pane > Trigger > On bookmark)
3.
Add slide transition timings through Slide Show > Rehearse Timings
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