Plastic SCM Integration (Source Control)

Hey there everyone,

Plastic is running as intended and we have committed several files properly.
But when it comes to diffing we ran into problems.
Like when we add folders to our outliner while two users have opened the scene we get conflicts that can not be shown in a visible manner

Also, could you please provide some information on how Plastic SCM is generally intended to be used when multiple people want to work on one project simultaneously?Are we even supposed to diff .uproject files?

Are there any built in Diff tools to let several people work on one scene or do we need an external tool. and if so, where do we find it?

Thank you very much for any insights.
All the best