I have a DELL UP 2516Dt and I used to connect it to my old MacBook Pro with a HDMI.
But for the new MBP. I tried the so-called "Thunderbolt 2 to Thunderbolt 3" but it's not working (I found a lot of negative reviews at Apple Store).
I think this picture below describes quite well my confusion.
What should I try now to get them connected?