How to connect SSD - external usbc drive for Macpro(2013) on thunderbold. What an adapter should i choose?

Hi guys.

Question / problem.

I bought an SSD drive and put it in a pocket with a USB-C 3.1 output (2nd gen)

I also bought a Thunderbolt 3 (USB-C) - Thunderbold 2 (female socket) adapter and a Thunderbold2 cable that I connected to the computer.

The disk does not work in this mac and on the second one either. (on any thunderbold connector)

I will add that the same USB-C drive, I connected it to my macbook and it works fine.

So, how to connect SSD via thunderbold connectors to macapro 2013?

Many thanks.

A.