I don’tunderstand the interest of collaborate. I first tought I would see the changes of my partner in real time, but its not the case. Can someone explain me how we are supposed to work if we have to upload our changes ? Lets say I build city’s building and my partner do the roads. When ill be done and I upload it, he will get my version where the roads aren’t there.
Correct. Your idea of what collaborate is, is something you invented. Collaborate, for most is version control. So artists will upload work, programmers will upload work, and level designers will upload work. If you both will work on the same script, something will give. If you both will work on the same art, something will give. Scenes (for now) are the same. I understand Unity might be or might not be planning a better workflow for scenes, but that’s not now.
For now to work around it you should use separate scenes and read into multi scene editing. This way, if the other user works on the “props scene” placing things, it will not overwrite anything except that props scene.
I would suggest having, for each level, several scenes which are loaded together to create final scene, so a “scene” is split in a logical way you choose. Unity supports that fine.
You can mess around trying to do live editing collaboration (and there’s asset store options) but even AAA avoid that directly because, well, it’s unreliable, hard to develop with and so on. It’s just filled with problems and the inability to revert problems easily.
To see if someone is working on the same file or scene as you, look out for the icon: 
and if you split the uber scene into multi-scene it should become manageable.
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