Can I insert a save file and still play online?

[SoDI]

I played a lot of this game on PS but my friends had this game on PC for a while and I'm so behind.

[Ember]

Yes. A lot of people have done this in the past.

Friend of mine in particular had lost his 500 hour save and used mine as a reference and modified it, with character name and all.

You will be fine.

[]"]]

You just need to change the Steam ID of whatever save file you get, using a save editor.

https://www.nexusmods.com/monsterhunterworld/mods/5995