Good chance its condensation water, only existing with a/c on.
Drips collect as a tiny puddle in a low spot of the duct work.
Then puddle rolls out of duct on right turn.
Drain could be partially open? Normal puddle under car?
Firewall seal intact, not letting tubing condensate seep inside?
An LCD digital inspection camera will snake into duct openings.
I used mine to see if a duct door was closed or open.
Plus to check area deep back in the cowl, etc.
Even a cheap one under 50.00 works fine. View orientation can be confusing.
Seen some that connect to a smart phone.
Examples:
https://www.newegg.com/p/1B4-01BP-00...E&gclsrc=aw.ds
https://www.walmart.com/ip/Waterproo...iABEgK-AfD_BwE
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