Same issue happening with me as well. I was able to get a single save to show up on my PS5 once, but since then no more saves have crossed over, and while saves from my PS5 transfer seamlessly to my PC, saving those games on my PC prevents them from going back to the PS5. I have my accounts linked properly and everything. When I turn off cross save on my PC then turn it back on and go into Load Save, you can clearly see the top five games attempting to be cross saved - the little red X icon appears next to the file name (next to the cloud) and selecting the game shows Cross Save - Uploading in red. However, doing the same on the PS5 does nothing - the game says Syncing but then nothing happens and no saves ever appear on the PS5.