Hi! So I started a new team project with my friend the problem is that I can't see the things he is working

I’ve tried dowloanding the project I’ve tried syncing nothing worked . I really need help cause we have to present the game. Thank you in advance
Edit:I’m using unity version 2020.2.3f1

First of all, I would use a version with LTS (Long Term support) just to be safe. Also, do you know how to set Unity Collab? I used it once with my friend and there were tutorials about that. If you can’t find any, write back here maybe I might be able to help. Lastly, you won’t see the changes in real time because you need to update them when your friends make a change. But, you can update anytime you want if they published their changes.

I would set up a Git repository and not bother with Unity Collab, and then work with it that way. Not exactly an answer, but Unity Collab is rather annoying at times and I prefer the simplicity and reliability of Git.