Hi,
I just like to write this so that for other people who are looking to switch from Playstation 4 to Playstation 5 with D3 to save their data to usb and not do what I have done thinking the cloud save will save all the hard work put into this game 
I have over 3000 PP and alot of over 150 Legendary gems and Primal weapons (all from season plays), 12 pets, 5 wings and so on…and lose them all because of this one mistake. Heartbreaking to say the least lol
D3 is my most play game and favorite. Played since the first release of the PC version, then got it for the Xbox 360, Xbox one X, Nintendo switch and then Playstation 4.
Oh well Just thought I share this to make me feel a little better and to advise others