I just went through the process of loading TWOs (The Wolves of Steel) on my Steam installation that I play through UPlay. I am very happy with the results. Here is the thread where I asked similar questions
https://www.subsim.com/radioroom/sho...d.php?t=244334
The key for me was to download the SH5.exe file and replace my existing Steam/UPlay SH5.exe file. Once that change was made, I uploaded TWOs and viola. Much better sim.
Good luck.
Momps