I suspected that the reason why some games don't have save file transfer on PS5 is
that devs need to implement their own save file import/export solution. This seems to confirm that.
This also means if you have already sold your PS4 (like I did) and want to use your PS4 save with the PS5 version of No Mans Sky you have to download the PS4 version onto your PS5, upload your save from within that version and then download the PS5 version and import the save.
PS4 to PS5 transition continues to be a mess.
EDIT:
DONT PANIC
if you already sold your PS4. You should be able to download the PS4 version of any game to your PS5, then upload your save, then download the PS5 version and import your save.
EDIT 2:
For clarification: This is only in regards to PS5 upgrades/versions of PS4 games. Regular PS4 games can read the saves just like they used to, can be downloaded from PSN cloud, no extra steps needed.
If people have suggestions on wording/formatting of my post feel free to suggest it. English is not my native language and this is my first Era thread.
EDIT 3: more tweets
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