I play SH5 with TWoS and a lot of mods, via Ubi Connect and all works fine. I have the DVD version plus 1.2 update downloaded. The Ubi cloud works, I save the games in the cloud and in my PC.
Try with SH5 updated to 1.2 and add TWoS, It includes an Steam patch.
SH5 2024 is TWoS, or if you want to try it, Sobers megamod. Vanilla SH5 is...lost in patrol.
Happy Holidays!
Fitzcarraldo