LG UltraFine 5K Display connected to a MacBook Pro mid 2015 - Webcam/Mic/Speaker not working I have an LG UltraFine 5K Display connected to a MacBook Pro (Retina, 15-inch, Mid 2015).
I am using a Thunderbolt 2 -&gt; 3 adaptor to connect to the monitor (and the display works just fine).
The issue is that my Mac doesn't seem to recognise the webcam/mic/speakers that are built into the monitor.
Does the Monitor support webcam/mic/speakers from a thunderbolt 2 &lt;-&gt; 3 adaptor? If so any suggestions as to what might be the problem here?
Does the Monitor support webcam/mic/speakers from a thunderbolt 2 &lt;-&gt; 3 adaptor?

No.  According to the specifications, it's a Thunderbolt 3 monitor that provides connectivity.  You need a Thunderbolt 3 port.  The adapter only allows you to convert Thunderbolt 3 to 2 or 1 but it doesn't give you any more bandwidth than what you have on your existing MacBook.
You have enough bandwidth to drive the display, but not enough to drive all the peripheral devices connected to it.