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You're using two separate systems in parallel, which have no way to communicate timing info to each other. There's some delay on the video side, and some delay on the audio side, both pre- and post-USB, and the Mac has no idea how to put them back together. Normally, two-system sound setups are genlocked together to keep their internal clocks synchronized.
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You don't need to use Illustrator to do this - three cheap or free scripts will do it:
Gridder (free) will arrange all the images the way you want:
https://github.com/dokluch/gridder-aftereffects
When you've gridded them as you like, select all the images, and apply a couple of Opacity keyframes on all the layers (to make them go from 0 to 100 opacity at the ...
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Unfortunately there's multiple possible points of failure here - the splitter cable might be faulty, settings on the camera or mac might be incorrect, there might be no audio signal coming through your HDMI, etc. It will need narrowing down with further testing to determine where the audio is being lost.
Do you have a basic 1/8" male to male cable that ...
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