Linking two seperate projects?

Hi, we’re currently doing an RPG for a uni project (between 3 of us) and we have each made a level for the game. How would we go about putting all our assets/scenes and the rest together? I have tried to simply add all the assets and such from one of the other peoples’ folders but that doesn’t work (purple/pink textures).

Any info would be great,

Cas

I think a common way to handle this is to export a set of assets as a Unity package, and then import the package into another project. (There may be other ways though.)