Solutions
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mstv's post in AC Unit - Small Button | Audi A6 C7 2013 was marked as the answerMight it be the temperature sensor referenced here?
https://www.audiworld.com/forums/a6-c7-platform-discussion-194/mystery-button-climate-control-2824594/
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mstv's post in Close boot with foot gesture and washing sunroof was marked as the answerI believe the closing by foot kicking only works if you have the powered opening/closing boot.
If it's just the standard A6 then it's opening only with the foot gesture as the boot lid rises as the result of a spring, not as the result of a motor.
Not the same car but a video here: