You will be asked whether to carry over the save data when you start the game for the first time provided that the full game is launched from the PC or console that has the save data from the demo version.
If you skipped this option and later decide to carry over your save data from the demo version, you will first need to delete the save data you created on the full game and restart.
It is possible to carry over save data from the PlayStation®4 demo to the PlayStation®5 full game.
However, it is not possible to carry the same save data between the PlayStation®4 demo and the PlayStation®5 demo.
If you skipped this option and later decide to carry over your save data from the demo version, you will first need to delete the save data you created on the full game and restart.
It is possible to carry over save data from the PlayStation®4 demo to the PlayStation®5 full game.
However, it is not possible to carry the same save data between the PlayStation®4 demo and the PlayStation®5 demo.