I have NMS on both PC and PS4 and iirc I can download save files from the PS4 and onto a storage drive. Would it then be possible to transfer a PS4 save file onto my PC and play it on that copy of the game? I don't remember where saves are stored on pc tho.
A few weeks ago, Hello Games announced that a No Man’s Sky Xbox Game Pass release was on the way. That’s going to arrive very soon, and that’s not all — No Man’s Sky Cross-Play support Basically I already have it on PC and PS5 and I already hate that I can’t play my pc saves on ps5 from the comfort of my bed. If I could play any save from any platform, honestly I’d buy it on every platform I have that’s it’s released on. They just released it for the Nintendo switch for 59.99 which I’m sure a lot of people think is
Its still a bit glitchy, apparently it only works if you start the game in multiplayer mode. i know that sounds like a no brainer but it is confusing because I can start in single player mode, then go to my network settings and switch to multiplayer on and get an in-game notif that the session is available to cross play and my friends wont be able to see my session in the multiplayer menu.

No Man's Sky isn't even being released on XBox One currently. I'm pretty sure getting Sony to do cross-platform between PC and PS4 wouldn't be hard at all. I don't know off hand as I don't own a PS4, but I'm sure there's a few games that already do this. True enough, no XBL, specifically. As for PC & PS4

Furthermore, cross saves will work across PC and Macs and Cross Platform will enable Mac players to game with the existing enormous player base on Xbox One, Xbox Series X/S, PlayStation 4
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is no man's sky cross platform pc and ps4