So, something i've realized which might help, I have no idea how though.

The saves sent to from the PS5 to the PC will upload back the other way (PC to PS5), but saves made on the PC will NOT upload to be sent to the PS5.

So, maybe it has something to do with the saves themselves? I thought maybe something had sort of glitched my 150+ hour saves but even a New Game save doesn't transfer.

So yeah, PC saves that originate from the PC will not upload period. PS5 saves work just fine)

Though, not all the PS5 saves. My most recent attemps out of the 3 PS5 saves on my PC, instead of all 3 uploading as normal, only 1 did.

I've even tried reinstalling the game and that didn't fix it.

More and more I think it's Steam.

I don't know. And Larian and/or Steam doesn't seem to care.