Link updates from others

Dear Adobe, 

There is something the world and I would ask : 

Why can't we make link updatable by others ??

A quick situation I just came across :

Last week I was on holidays. During these, a designer of my team had to update a design I started on which I created a review link my client has received. 

I came back from holidays, had to make some modifications on a design I created before my holidays. But my designer just told me he had to make some during my holidays because he couldn't update the link for the client, so he made a new XD file. So I just spent 2 hours on modifying the wrong xd file. And now I have to copy all the design to paste it on the new document he made, because the client now have his link, not mine (I can't update his link, like he can't update mine). Next week he'll be on holidays, so I'll have to do the same operation...

It's been a while since the whole community asks for this vital feature. And I'm pretty sure this feature exists in the past. Updates are coming over and over and no sign of it.

So, WHEN this will be available ? It's really, really, really a time loss. 

Thanks, best